406 vs 421 sbc sound First test with customers carb 745HP (14:1 C. 6) 406 for a procharger, thought I would share the results. 625 lift roller valvetrain. Single digit power differences from 4K to 7500 rpm. And flattop 377 / 406 pistons. does the 1. You can use a 6. Chevelle has a 425ish HP 454 and Camaro has a 525ish HP 406. 23 compression with the Fel-Pro . The recent 383 GM crate motor test utilized some 1-1/2" Hedmans on a 450+ hp motor. looking to make peak horsepower around 7000 - 7200 rpm. See less See more ML67. I mostly ran SBC Corvettes, but a couple of my friends had 409 bubble tops and a few had Pontiac 421's. 875 stroke) 95% street/strip combo, pump gas. Dart Pro1 230cc intake, 23deg, 64cc chambers, 75cc exhaust heads. Late-Model 402ci LS2 Any suggestions or even sound clips would be greatly appreciated Mike . 904 lifter bores. 12 to 1 SBC 406 with AFR 220 and a Straub custom solid roller. My interest is on the Hydraulic Roller Voodoo Retro-Fit Lunati 20120711K (60111). I wanted to use my exsisting headers ect. My 406 engine that runs on pump gas made 532hp at 5400RPM and 547tq at 4500RPM by Valley Crankshaft in Boise Idaho. 6" valves. We run the Brodix 18X heads a custom A 396 is the same stroke as a 421. Sbc 406 tunnel ram 1. I am now entertaining the thought of another build. I would be happy to get 580 to 600 hp out of it with room to move in the future. 5 roller rockers on exhaust 700R4 3. Would build similar to a couple 383 builds that I have done. com/stores/ramblinaround-storeThis thing is definitely plenty healthy. 64cc chamber. All make over 600hp on pump gas. Does it get good fuel economy? No, but I dont drive my nova in looks for good fuel economy. 875 and 4. Or about a small engine someone was spraying with nitrous. roller cam with 255 at . Scat cast steel crank, 6" forged rods, forged flat top pistons. Worked great low end. 07 comp, ported Trick Flow 195 heads, RPM Air gap, Holley 3310, Straub HR . Although it is probably true that 1. After two sleeve jobs ( one on each side) I put the crank A friend of mine with 406 small block in a 65 Chevelle needs a cam recommendation from the "real pros" :beers: It's a weekend cruiser with appox. I am in the U. ’ Then, you pop the hood and people will say, ‘Oh $&#@. 90 with similar first gear ratios. As for the As part of the rework on my 406, I've decided to go with a hydraulic roller cam this time instead of the solid roller I was using. Generally cams like the Thumper emulate the idle sound of the 1960’s and with 11 to 1 compression ratios the performance of that period of 100 plus octane fuel. 4. 1 2 of 5 SBC 406 3240 pounds 1. Anyway I’m starting fresh with this 421 and the heads are not returnable because they were installed. 480 stroke) that is based off of a dart 372 ci small block that made 470 horsepower and 470 ftlbs of torque and that was with just a mild low 220s @50 hydraulic flat tappet cam and dart pro 1 180cc aluminum heads 9. I have been very happy with the reliability. 904 lifters because of the smaller base circle cams. 7000rpm, has to be Hydr. I just want to go faster. 000". With the same I have 4,244 lb 1976 chevy caprice with a stock sbc 400 in it. 73 12 bolt I have a 406 sbc short block that I am going to build. 040 over and a 3. I'm sure abit more head, more rpm with more cam can get near 700. Everything has been great up to now, but I had some engine problems that need to be fixed once and for all. My 421 makes gobs of power and tq and is pretty darn drivable. Its a complete virgin block, never been bored or undersized. 00" rod with a 1. 7:1 compression. The 406 there was under 9K. Or don't talk about a small engine you read about in some magazine article either. com that made mid high 600's with hydraulic rollers. 10 12 bolt. 9 shots per min on 420 vs 2. 030 over bore. I also don't want to hear about your buddy having a powerful 200 inch small block chevy either. i have afr heads and was concerned about the square flange. The 421 seems to be very popular today using the SHP block and Callies Rotators are the same money whether its a 383 or 421 I have run a 406 combination in my 79 Malibu for about 4 years now. The chevelle is a 3. 0 @ 7500 Peak TQ= 585. a lot of kits with the 6" rod. -Next option is to purchase an aftermarket block and have the required machine work completed A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Low hours. So far with a . I have several buddies that i hang around tell me time and time again that a 400 sbc is the only way to fly. 547/. Transmission will be a 4L80E (Converter to be determined) . I had the intake manifold. “We do all of our own machine work here,” he says. Went to the Dynatech 1-3/4 to 1-7/8 stepped headers which fit perfect. Or stock crank, rod, cast flat top piston 406. Then I bolted on an 18" collector extension. 060" over 350 in my shop right now. 000 H-Beam Rods, JE 2618 Forged +10. It’s probably got a cam in it. 165 BORE, . 1 shots per min on 406 If you shoot nonstop all game from 0 second match start to the full 20 minutes, you shoot 38 times with 420 and 42 times with 406. 50 . Of your going to build a 406 go with the Pro block BBC cam tunnel, 4 bolt billet caps from front to rear all studded and . B/B 12. There really is no such thing as a good, cheap, factory head for BBC. Save Share Reply Quote Like. Also have a scatt ultra lite 3. I had one friend with a big Ford 406. 040, 415cu is a . 700" LengthPistons: JE Custom 2618 Forged Aluminum, 18cc Dish, Coated SkirtsRings: Stainless Steel SBC 406 fully studded block (block is a 511). Talk to steven and ask about Corey Fier's 18* 406,he dynoed it. They have inefficient chambers. I added the Billet Splayed Main caps to mine. 125" BoreCrankshaft: Smeding 4340 Forged Steel, Internal/External Balance, 3. Jump to Latest 5K views 5 replies 2 participants last post by Dyna Apr 14, 2011. 31 12 bolt "I would rather have questions I can't answer than have answers I As i said before, i'm on a 406 sbc project. 6 rockers competition cams xr280r Select Hi Tin block 4 bolt main machined 030-040-060 - 750. 875 stroke ? What kind of machinery ? Im planning on converting the 2 bolt into a 4 bolt main. brandysmith July 14, 2018, 10:16am 6. Here's what I was thinking. Jump to Latest 412 small block M-20 4spd 4:10 12 bolt Sold, went to Sweden 1957 Thundarbird Gasser On the bigger engines like the 421 the Air Gap has to small of a CSA to support air flow at Higher RPM's . Matched to 1205 gasket. 155" Actual bore size will be approx. Heads are Dart pro 1. Do have some shitty 882s dont want to use. JE pistons, Fully ported dragon slayer heads, wiseco boost line connecting rods, dart little M block, callies compstar Small Block Chevy 415/421 Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft, 3. 21@116, so the big block would be a fender length ahead. 625 15:1 CR Combo !! so you need to be careful comparing any 383 vs 406 or 406 vs 434 or 383 or 406 small block I currently building a 406 with a 4340 forged scat rotating assembly and a set of 195 AFR heads. 3/4 heddman header with the s&s collectors sound right for this power I built a 422 sbc using a stock block. Was crusing Holleys site, and saw the carb selector wizard. Chevy Small Block Dyno Tests - Old School Meets New. I am aware of the 383 vs 406 Arguments . 75 vs. I would suggest a 406 if stuffing in a stock front in of any car. Username Post: 421 sbc (Topic#332719); 498 chevy "15th Year" Platinum Supporting Member Posts: 527 Age: 73 Loc: hayward ca. The hydraulic roller is in a zz3 350 with 195 AFR heads. CNC SB Chevy 415/421 Compstar Rotating Assembly - 12. Be sure of what size mains you require before purchasing. It does not have to have any 'street' manners, and won't have AC, power brakes, etc. 421 SBC CR, Dynamic CR & Cam timing. He has a 750 VS carb, , dual plane aluminum intake, Brodix IK200 heads with 64CC's and 1 5/8 headers. I didn't believe the results and retested, with and The reason I ask is that I am preparing to build a strip only small block Chevy that needs to produce a minimum of 450 horsepower at the flywheel. Notice I didn't say ricer. 580 @ the valve, on a 112. Jump to Latest Good reading here, been looking into this also as I have built some 406 and 408s that did real well. Conventional lore has it, 1000 lbs. It seems to have what i want. 65mph w/1. You will need more cam than you have to turn 6000 rpm. is a second on the 1320, so do the math. Nowadays SBC's are displacing 454 c. 5" and . Talk real. Had to run meth injection to see any gains. Our pump-gas 383's average approximately 475 HP and our 400's come in around 575. 00 I would start with a 421 or a 427 the 434 is going to bore the block to the limit from the start. “The decking, boring and honing is all 441 ci C4 ZR1 vs 406 SBC C1. So the rod ratio and angularity with that configuration isn't too bad. I'm currently on the drawing board building a 421 SBC It will be used for strictly 1/4 mile (bracket) drag racing, 3100 lbs car, t-400, 6000 stall. But I know of a 406 for sale that makes 650 at 7000 RPM and 550 ft lbs with 10. (unknown) 406 SBC M21 3. 050, . lifters for ease of use and not needing to set lash all the time and 23 degree heads for standard part compatibility. 1 vs. Does that sound right to any of you? I currently have a 750 Mighty Demon on there. That’s clean, man. 4. 08, 220cc 64 heads complete with a roller cam ect. S and I am building a small block chevy 377 (4. of TQ at 4500 rpm. cam small block ? or a stock forged crank, forged piston, solid, or hyd. Turbo 400 with a 2400 stall converter and 3:55 gears. 2 compression 406 with forged pistons and scat rods. I was told that spraying on this rod and crank combo is a very bad idea my question is, can I make 900 or so hp. Very pleased with Straubs cams. Have you tried shifting Building and testing a 406 ci small block chevy vs a 402ci ls2 chevy small block - Chevy High Performance Magazine SBC CHEVY 406/421/434 CUBIC INCH DART SHP BLOCK FINISHED OUT AT 4. Steve Land Jr. Be sure of what size mains you Requirements: N/A SBC, CR around 11:1, max. That’s the reaction I’m going for. What it lacks in displacement though it makes up for in architecture. That is why some people appear to be bright until you hear them speak. 062" compression height piston. 0:1 Mahle Flat Top Pistons 421 SBC. I am building a 421 sbc with a short block from Ohio crank. If I pull into a car meet, I want people to say, ‘Hey, look at that. . It's a weekend TOY that will also spend time at the dragstrip. M. 5:1 compression Re: SBC 383 vs. D. Dart Sportsman II heads with 2. A. The second one is a 421 brodix race rite cnced heads, eagle crank rods, billet caps, team g intake ( done by wilson) csu blow through carb, vortech t Real world street 406" SBC parts choices and results. Easier fit since you don't need large headers and large induction like you need with these 3. Jump to Latest twenty years ago I made 757 HP with a stock block 406-Tunnelram with two dominators. Two bolt,cast crank,ARP stud kit with Moroso windage tray,polished and peened pink forged Chevy rods,clevite bearings,weisco pistons,press pins,Comp roller cam 565"/289 /112 center line ,intake,11. I did that with my 421 cubic inch small block. I originally intended them for my fairly stock 406 short block and pulled several head bolts threads, 😢. I have read just as many problems with SBC headers and BBC headers. The original plan was to have my current sbc 355 built to a 383. , Funny you should bring this right now. It is not low budget or cheaper to build small engines. Getting a bit more compression with the added displacement would be nice since the heads have 70 cc chambers. This block has 350 mains. 29 sixty 6. 12 months NO INTEREST plus tax-free. In the modern world of 91 maybe 93 at best compression ratios are too low to accommodate 1960’s cam design. I recently purchased AFR heads, 195 street port. Anyways Im curious on how to build a 421 SBC. a good friend is having his Vortec motor rebuilt rebuilt right now and the machinist keeps trying to talk him into the 4-7 swap cam, promising about 40 more hp on a simple rebuild. To get 406ci is nothing more than a . Probably only A 383 has a 400 crank as you know. Built this low compression (8. ’" Find out why that'll be an appropriate response for this 406 cid twin-turbo LS engine! I built a 421 about 10 years ago, dart little M, scat rotating assembly, je pistons, dart 215 pro 1 heads, 620 lift hydraulic roller, victor jr, and an 830 holley. 516 233/243, Hedmans, 200-4R, 10" 3,200, 4. The only thing he is doing is getting a bigger cam and having the heads done to accomodate the larger lift cam. I just dont know if I should go with a 200, a 215 or a 230cc sized head. Stock 400 block bored 0. 406 SBC M21 3. 420 lobe I can get away with a 1. 08 and the camaro has a 3. I hear ya on wanting to go a different route as far as cube numbers but my little 406 dynoed 540 hp and 551 ftlbs torque with an 1-5/8 header. Matt's 423 doesn't sound like "most" SBCs. We owe a favor to a good friend who wants us to build him a street 406" SBC, typical single 4-bbl, daily street driven. (Exagerated by a little). My 422 is based on a factory 509 casting and is fitted with Oliver caps 1-4 and a deburred/smoothed rear cap, short filled, deck plugs, steam hole plugs, etc. The 1. ft. In this case, a short stroke has some benefits. Correct me if I'm wrong, but the reload advantage of 406 is not worth it. Well my two hot rods have one of each. I dont think that would break the bank too bad. 155" or larger Important Note: 2pc. Imagine taking a small block head and placing it on a big block engine. 7 comp, 830 DP, 4000 stall, Turbo 400, 3. I beat the heck out it and don't expect good fuel economy. I got the DART SHP block 31161211 thru summit racing on special financing. I have about $4500 invested in the 406 I ran. 08/1. 5 posts · Joined 2016 Add to quote; Only show this user #1 · Oct 25, 2024. dynoed his cmobination (with same headers that would be used in the car(1 3/4 x 421 sbc with 210 heads would be a breeze to make 550 hp. 025" Deck Height, 1 Piece Seal, 4. C3 Tech/Performance - 406 SBC Problems to Resolve This Winter - As some of you know, I had a Dart SHP Block 406 SBC built for my 77. 5-1 406 sbc with a large roller (undisclosed to me), heads that flowed in the 315 range, and basically same setup more or less. Jump to Latest It'll never sound tame again unless you want it to. I'll know approximately 15 minutes after it's running if it makes more power than the BLP BX-4 Alot more 406-421-434 builds but I wanted to be differant. "The idea with the car is to have it appear and sound like a clean Foxbody. 73's Light travels faster than sound. So max you're shooting 4 more salvoes in a full game. Would like for your opinions, thoughts, recomendations on a camsahft for this build. He needs enough vacuum for What's the BEST SBC to build for bracket racing in 2019? Let's discuss what's going to be in the car at the drag races this year, plus some other updates fro Im looking to get educated on the 4-7 swap camshafts. 0" SCAT COMPETITION RODS. Dyna Discussion starter 12 posts · Joined 2011 Add to quote; Only show this user #1 · Apr 14, 2011. I started building the 383 stroker and mid stream changed it for the bigger cubes. and factory a/c If you got a Dart SHP block build a 421 and be done it does not cost any more for the rotator. 29@114. AFR Eliminator 227cc intake, 23deg, 65cc chamber, 80cc exhaust heads if youve got a 400 block you currently tend to build a 406 vs a 377 , the 377 used to be the better choice simply because in the past the only source for heads was ported O. Here what I assume so far: Dart SHP or Will I ever put one in my nova? Probably not. Well, no big secret SBC's are lighter. He sold his previous engine to one of his friends, and Debickes and Iacavino got to work on building a new small block 421 Chevy engine with nitrous. so don't want to know there is an engine up there -VS a SBC 434 14:1 CR Dart Pro 1 215CC Heads 2. 875 stroke. It will go in a swb Chevy stepside. specs: 406 10:1 Dart Pro 1 Performer RPM (newwas using Vic Jr) 1. I would like to send the prop back to the shop to see if they can give me an extra hundred RPM. 5 to 1 comp, 220cc heads, and a 250-ish duration hyd roller made 640. 050 and 2800lbs that Kik start - sounds like quite an engine. The solids are in a 434, 421, and 406. e85. There is just nothing like the sound of a well I have always sprayed 225hp and then a 350hp (2 plates stacked) on my sbc 406, 750dp holley, solid roller 660 lift cam, with an old 144 weiand supercharger. Using an older set of The car was built with a 1972 SBC, two piece rear main seal, with a T56 from a 1996 Camaro. So ? Is destroke. 72 It will pull to 6900 crossing the finish line, but the big cube small block needs good heads. Brodix and Profiler heads are quality companies. Light travels faster than I've also back to back tested a 3310-1 against a 950HP on a 500+ HP 302 small block Chevy on the dyno. 1 compression. 73's Machine work by Torvinen's machine 11. It lasted about 10 or 12 runs on the dyno, then the STOCK crank broke. May need more spring pressure than 155, shim to 175-180 would work depending what lobe lift is available before bind I ran those pac spring afr195’s to 7000 in a 383 sbc. *** IMPORTANT NOTE *** You may add items into your I dynoed a 406 SBC bracket engine with typical 1 3/4 x 30-32 x 3 with a collector about 6 inches long. 155, and drill steam holes in the AFR heads. Thanks to some previous sound advice from TC, what I have is mind for the cam is something around 235 intake and 240 exhaust Have 400 and 350 rods. SHARKBITEATTACK Discussion starter. ap72. I have also thought of doing a 400 block with 350 crank for a 377. 030". As been stated anything above 550 foot pounds of torque will overwhelm a street tire producing not only a lot of tire smoke, but loss of control if you punch it on the 421 vs 434 sbc. 0 with a 10" converter and 4. I was wondering if all you hot rodders could give me your opinion on 383 vs 400 or whatever it has to be bored to. Rear Main Seal. 85@121(bumping the rev limitor) Speierracing heads Jones Cam Design FTI Converter Do those bowtie 363 sound like they'd work good with that combo? Ran acoss a top end that includes those heads and wanted to see what YB 406 Vic Jr vs. I picked up 96 lb. 800" StrokeRods: Smeding 5140 Forged Steel I-Beam with 3/8" Bolts, 5. Non-Chevelle project, will not be a daily driver, four speed, 3:73 or 4:10 gears, single four barrel carb, headers. The parts I have include •AFR 220 Eliminators, 1110 competition ported heads, 8027 spring upgrade, titanium retainers, 65cc •Crower stainless steel full roller rockers, 1. cam and stock rocker arms I was going to get a new 434" SBC short motor put together but took the advice that a 3. I was making a representation of what is possible with tried and true combination's of common cubic inch small block's. My first go around with a 406 was a full second faster than my 355. I like the looks of a gen 1 sbc under the hood of it also. He came with the assumption he'd need 434 sbc 421 sbc. It can affect the sound and power band of your engine. Hi Folks, I need some help with our SBC engine build. For the money involved,a 406 would be a perfect street motor. Pistons were a SRP due to the Procharger, cam was 226 @ . Overview Building a high-performance 421 cubic inch small-block Chevrolet (SBC) engine that produces 700 horsepower is no small feat. makes 600hp and 460 ft lbs with 14. Chris Straub Straub Technologies SBC 421 with AFR 220 and my semi custom hyd roller for AFR The customer recently returned wanting the guys to build him a new engine that runs on pump gas. Runs as cool as any small block. V-8s sound great at that rpm . 377. 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. , and it spits out 950 HP carb, 1000 HP carb, 1050 Dominator. 31 12 bolt "I would rather have questions I can't answer than have answers I can't question" :R. I installed it last winter, and put 8000 miles on it this spring/summer/fall. 040 over with a longer stroke crank 3. a small block of the same size and spec's will be very equal. What all has to be done to the block to allow a 3. 406 with 11. 7x rear gears (wellwhen I save up a new rear) Finally getting ready to settle on heads and a cam for my 406 SBC, and looking for advice again. I am mainly concerned about the 350 Block vs 400 Block strength and overheating issues . RamblinAround Store: https://teespring. Hyd. 625 valves. I've got a complete small block Chevy top end off an engine that I threw a rod through. An acquaintance of mine had a 14. I think he hit the light's at 8200 rpm. I've never had any overheating issues with performance engines based on the stock 400 block that were block related. 85" of extra length is all in front of the engine mounts, since the mounts are in the same location relative to the back of the block. Brian M 1980 Camaro,1966 BelAir,2004 Dodge Ram HEMI on 42" tires,72 Chevy Short Wide project I’ve had Chris Straub from Straub technologies do 4 cams for me. 383 or 406 sbc. If you're building a motor to a power/rpm level that will require splayed caps on a factory block, just step up to an aftermarket block now. 75:1 pistons, and Crane . I currrently have at my disposal a complete (disassembled) Stock 400 small block. I was looking into the Dart Iron Eagle Platinum series cylinder heads. A 421 needs a stroker crank which costs Hello there. 10:1 CR. I have around $3000 to build this motor. I ran a 144 on a 327 sbc. The BBC is taller and longer than a SBC, but the 1. I looked at them and tried to compare them to my old Dart 215 cc with the optional 2. Time will tell how they work out on a 406-421. 580 lift (proven to rev to 7000 before floating the valves with this setup and same SBC 421 cylinder head selection. 7 race prepped rods, Speed Pro 12. The bigger engine will be faster, and it will be turning more rpm at the finish line. The engine compartments are huge. But the difference would be small. Vortec 062's 406 w/hyd. Great acceleration, torque and It proves that 1 5/8 headers are more than adequate for most SBC street combos. A 409ci is . Block decked to 9. Both manuals. 800. 8cc Dome Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More. Put in my parameters, 406, 7600 max RPM, heavily modified, etc, etc. I dont not know what you are trying to end up with, but your cam is quite Thanks for your words. 3. I would like to keep it a pump gas motor and also use iron heads so I dont get hassled for having aluminum heads at certain places. For intake manifolds, the Holley 300-36 or a similar dual-plane design can be ideal. 05 valves) Comp Cams XR300HR hydraulic roller cam specs: 300/306 advertised 248/254 @. They obviously have never driven a SBC 406 or a blown 540 BBC, or a NA 632 big block. I am having ring seal problems with the stock block, but it may be caused by not Torque plate honing it when I have it bored. For a good deal from his sbc 350. 30 posts · Joined 2006 Add to quote; Only show this user #28 We run a Naturally aspirated 421 SBC in my daughter's 69 Firebird . 31 12 bolt It all depends on your idea of manners. i. Intake will be the Victor JR for this set up (I'm 100% sure) there will be a 1" nitrous plate between the manifold ant the 950 Hp Holley carburetor. 10098 posts · Joined 2005 Add to quote; Only show this user IMO a BBC fits just about as well as a SBC in these cars. E. 875 Stroke, 400 Main, Eagle 6. I want it to be quick but not radical, except for a good idle sound. 300 raised cam Dart block to avoid this problem but you don't have an oil filter pad on the race block so you need to do something in a remote filter. 562/. Perfer pump 93. mild hyd roller cam 195cc AFR heads All Forged rotating assy There are some parts matching combos that you can get an idea without reinventing the small block chevy engine Tradition gen 2 LT1 small block mated to a conventional H pattern manual trans in a 4th gen camaro running mid 6’s in the 1/4 at 213mph. in totally aftermarket form, BBC's can Hi, I think that instead of going ls-style retro in my car, I'm seriously considering just building a sbc 400 that I have. The SBC is down on displacement, although with enough money you can make a 454 small block. I have a buddy who offered me a set world product heads Sportsman 2 2. a guy around my way has two blocks that have been through the necessary machining and reassembled what im asking is what would most of you racers go with the 383 is a fresh 30 over 350 block with a 400 cast I want to build a 421 or a 434 this winter. 600 lift, cut on 108 L/S. 406 units. 4 to 1 compression Ported 200cc Brodix RaceRite heads (2. BALANCED IN HOUSE. Engine is a 421 SBC built with a Dart SHP block. R. 7 & tuning 406 SBC M21 3. However the small block would be a slightly better driver/tower due to its better low end torque. Wonder who has built one and if they'd do it again. 406 sbc,thumper cam. 125/1. My combo: 423CID stroker 225cc Brodix Matt's 423 doesn't sound like "most" SBCs. FITS AFTERMARKET BLOCKS WITH 350 MAINS. All the 421's I have built I have used a solid roller and have gone to the . 875 Stroke. 415 vs 421. ( No electronics and on foot brake ) Great lil motor, make right at 700 hp. Have read all of the 406 combos I could find. 9 compression ,smallish roller . 3 solid rollers and the last one was a hydraulic roller. small block sound. I want to know I run a 406 with ported Vic Jr. Reg: 09-28-07 As i said before, i'm on a 406 sbc project. 1. and he can tell one all the attributes of having one. After takling buildsheet with the engine builder the 421 would have been near the same cost as what I wanted with a 383. hyd. General Q & A - 406 / 421 sbc builds - 94Sylvan- I have never had engine on a dyno but an educated guess would be peak power at about 5500-5600 rpm. SBC 421 or 427. -My first option is to have the Chevy 400 block machined for 4-bolt splayed main caps, punch it out to 4. B Williams. To do that on a gen 2 LT1 small block is extremely impressive. 5" headers and a 600 would work fine on most SBC street cars, my opinion is it doesn't apply to 500hp+ combos. We just bolted on a BLP 1230 Alky Dominator on my 23° Brodix Track One 233 421 s/b Chevrolet on top of a SV2 intake we put a 4500 top on. More motor 383 vs a 421 for almost the same cost win win. I am listing everything that I currently have below and then listing what I still have to purchase, engine wise. asbi street drive my car . out of one of these 6" combo kits? does any body run the 6" rod kits, with nitrous success? thanks for your time, and info. With the Eagle Stroker Kit witrh the Stroker rods you can run a standard base circle cam also. First night the track was open here in Spokane Washington at the SCR strip! With a fresh list of upgrades the first pass running all motor was rather impress The SBC is down on displacement, although with enough money you can make a 454 small block. Rebuilt bottom end with splayed 4-bolt caps, forged crank, pistons and h-beam rods. You need a small base circle cam or the rods will hit it or go with a +. ), second test with our Just joined the site. 309-792-3333. 5 ratio Hmmm, good question. Anyone here do a similar upgrade, or do similar engines with the different strokes and get meaningful benefits from the larger engine? Real only diff. 155 bore x 3. The right size headers/carb is combo-specific but going too small can kill hp just as easily as going too big can kill torque. It provides a good balance FULLY BALANCED SBC CHEVY 406/408 ROTATING ASSEMBLY WITH WISECO FORGED -13. Modern cam design uses less ramp with more In the process of rebuilding my sbc400 to a 406. Bowl blended and guides thinned down as well. Getting to your goals with a BBC can sometimes mean higher octane, more spark lead 406 sbc guys? Jump to Latest All the stories of 400's running hot don't bother me a bit--the hottest running small block I've ever seen is still the . 00" stroke engines. 600 valves 1-4 Barrell ProSystems Carb Peak HP= 756. my 406 with titanum rods and rev kit and crank girdle is rated at over 10 grand. I got a 421 sbc 13. I'm waiting for the specs on the cam but I know the heads are pretty aggressive but I think with a 406 they should work good. 02" and 1. 200/1. Jump to Latest 258 views 1 reply 2 participants last post by gnx7 Oct 25, 2024. That was with bowl blended dart Sportsmans, 2 bolt studded block, GM 5. Is this in an apples-to-apples comparison, or are there perhaps (Add) My guys just faxed the dyno sheet over to me from a 421" SB similar to the one also mentioned above. 145" to be finished out at 4. 875 crank could build 421. Was too restrictive on top end, max I saw was 10 psi. 072" head gasket,TFS twisted valve 13Deg intake with a 62cc Spent Friday on the dyno testing 421 pump gas build for a customer, He was looking for a 600 horse pump gas build and we achieved our goals with this build. 20 years ago, we did a basic 406 with a 249/259 106 LSA solid flat tappet than ran 7. Can go. 55project. But 13 to 1 is way too high for me for i would run the 406 for shorter stroke than the 421 that way you can get a better Is there a difference in sound between lets say a high performance 11:1 421" means you have room left for a rebore or clean up if required. I see that the 6" rod combo is the cheaper way to go . 5 to 1 compression. Dart SHP Special High Performance Small Block Chevy Cast Iron Bare Blocks 406 sbc, 10. 05@110 9. S. Joe probably has more experience with the 406" than anyone, but all thoughts welcome. 050 on the intake side and 260 on the exhaust side, . 1 @ 6300 its pretty bad when a little Dart 215CC 1-4 Barrell 434 14:1 can beat a 401SBC 2-4's SheetMetal Manifold 18deg 2. Is there a difference in sound between lets say a high performance 11:1 compression 406 small block and a high performance 11:1 compression 468 big block? Got a sbc with a nasty cam and fenderwells and flowmaster 40's and 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. but was the last time I'll build a big inch small block. Website is up and running Estimated 1/4 mile for the same car was s/b 12. I can upgrade down the road is short order. Post by PackardV8 » Thu Nov 30, 2017 6:24 pm. 415 SBC pump gas street car:twisted: It's fast to me and it's mine! I’m looking to build a 414 421 sbc (3. 406 SBC with Flowmaster FlowFX Mufflers so was looking at heads for a 406 CI small block. I like your plans. 766's stroke was 253cc. Finish line rpm would be geared appropriately to 7200+ RPM. 36@109. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Engine is 10. 406ci Traditional Mouse Vs. SBC 400 (Jenny) I think she is playing with all cubic inch options everything from a 377 using a 400 block, remember she is a converted high reving import owner :p: to a 383 or 406. 406 needs more gear than you might think. 5cc RD DISH TOP PISTONS. Jump to Latest 21 - 40 of 94 Posts. I'm just being a jerk That's all. And I am frustrated with these, given the money My mild-mannered 406" SBC runs 1-5/8" primaries with 2-1/2" collectors, with no apparent loss of upper end power. 383 vs. 73's 406 SBC M21 3. 10 gear There was a few street pump gas motors posted around here or chevelles. Jump to Latest One talked about a 406, this one talking about a huge-budget 434, and one that just said "waz up". Really, a big block vs. It's a 509 block engine. 2 years ago they set the record for fastest H-Pattern stick car in the world. Winter has arrived in PAso now to resolve a few problems. The 421 seems very popular now and the 220 AFR's would be the way to go. from Jake 200-4r w/ 3. About 7 or 8 years ago, I made 784 with a stock block, and it kept cracking cylinder walls. in my search I have come across in the 2k range three brands and types of heads. 000 base circle cam using a Callies rotator using the compstar rods. I don't know if i need or not a small base circle cam. casting, based cylinder heads, being available that could not effectively flow enough air to feed a 406 spinning up at 6500rpm, but in the last 20 years aftermarket GM headed 18* 406 Victor Glidden intake 13. The cylinder head design concerns the limited valve size that you can put in a small block head Big block sound vs. roller small block ? big differance . Currently I am propped it about 5400 running a 23p Mirage. That is . 875" stroke 421 would require less clearancing than a 434 or similar 4" stroke engine, plus a wider range of 23* heads would suit, rather than a 4" stroke motor which would require a larger head if I wanted to rev it past 7500rpm. 93 @ 112. CNC-1249-CS PART NUMBER. What platform are you looking for? 400-406-414-421, Budget or quality parts? Sound about right? Carl 1972 Chevy Nova - 12. I can toast the MT et streets at 30mph on the street anytime. between the two would be 3. I dont think that you really need to get extreme with the bore and stoke. Heads, super victor, 260@. I'm looking to build a high compression 406 cu in full race engine for nostalgia bracket racing. 31 12 bolt Plus that big cu in sbc would have a really throaty sound. 10 sec. Great acceleration, torque and SBC CHEVY 406/421/434 CUBIC INCH DART SHP BLOCK FINISHED OUT AT 4. First off, I really on more than one occasion pushed the car a little beyond its limits, floated the valves at 5,700 RPM, and kind of damaged the cam. Surprisingly it makes just under 500hp. Would like to run pump gas. . Jump to Latest Is there a difference in sound between lets say a high performance 11:1 compression 406 small block and a high performance 11:1 compression 468 big block? My best friend has a '67 pro street Nova and is a small block guy. I got the bigger exhaust valves because I considered putting 250 or 375 hp port injected N2O to my 383. Super close race! ZR1 vs C1 Corvette . The heads are drilled for the steam holes. 030 over bore, decked for zero piston height Pistons are Wiseco #5535A3, +8cc volume (estimated compression 11:7-1 with 72cc heads) My calculations put this combo up around 550hp and I never heard a 550hp SBC sound smooth at idle unless it was a turbo, procharged or nitrous enhanced motor to My friend is building a 377 and I am building a 406 and here is some info on both My 406 Forged bottom end 10. I have the "509" 2 bolt main 400 block. 230cc. Like said tho, cam libe choice and a good lifter is needed to work at higher rpm. Air Gap. Some folks like the *spin the heads at the cruise in* sound. Block: Smeding Heavy Duty 4 Bolt Mains, 9. My friend kept braking crank shaft in SBC 406/421 build advice needed for a 58 Suburban. 040 OVER, SCAT INTERNALLY BALANCED CRANKSHAFT 6. Save Share 406 SBC, AFR 195's, Comp 242/248 @ 50 hyd rol, RPM Airgap, 10. A few days ago I run a similar 406 on the dyno==Afr 210 heads, 236-242 hyd roller, with an RPM airgap manifold. Feynman Afr 220 406-421 sbc is a tried and true street combo with hyd roller. AFR 195s were used with a Victor Jr Sunoco 280 which my guess was probably 105-109 octane. Was looking at fast burn Hey you guy'sI built a small block 406 for my "73". Rear Axle to be either 12-Bolt Chevy or 9" Ford, Hydraulic Roller Camshaft & Gears will be selected, based on Combination Requirements. Also keep in mind the smallest heads GM put on a BBC with 3. 3487 posts Why not the tried and true 406 in SBC or better yet a 408 in a LS General Q & A - 406 / 421 sbc builds - Anyone care to share their build experiences with a 400 small block chevy? I have several blocks available, thinking of building a GM block 406 or possibly a 421. The pits at Island Dragway, Montgomery, and Old Bridge all had that beautiful aroma of race fuel. Give stealy performance a call in east moline Il. 6 roller rockers on intake 1. cdjt xoudvd ghkc iaoukg dlts vbzyh traln ejkuvbsg whrqs vts