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Old 11-29-2011, 06:20 AM
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406 400-500hp?

hey everyone i am atempting to build a 406 with 400-500hp. this is my first engine build so i was hoping i could get some help from the hotrodders comunitty. any input is welcome.

here is what i have so far:

400 (.30 overbore) 406
4”crank
10:1 compression T.P.I pistons
500lift 280 duration camshafts
Original 400 block
Wieland stealth intake
Holly 750 double pumper
194cc stock heads
Headmen headers

thank you all

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Old 11-29-2011, 06:46 AM
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Quote:
Originally Posted by blakjak
hey everyone i am atempting to build a 406 with 400-500hp. this is my first engine build so i was hoping i could get some help from the hotrodders comunitty. any input is welcome.

here is what i have so far:

400 (.30 overbore) 406
4”crank
10:1 compression T.P.I pistons
500lift 280 duration camshafts
Original 400 block
Wieland stealth intake
Holly 750 double pumper
194cc stock heads
Headmen headers

thank you all
If its .030" over its not original, if it has a 4" stroke crank its not a 406, what are TPI pistons? GM never put 194cc heads on a stock sbc. Your carb more than likely needs some work, "headers" is a generic term and those oculd be great or real POS. Same goes for the camshaft.

Basically you have a useless list of jibberish that leads me to believe it will blow up before you ever make it to 400hp.
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Old 11-29-2011, 09:28 AM
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My input is---for everyone really, and in no way a direct chastisement, but a general question, can this original 400 block take 400-500 hp?

i'm not talking about 50 or 60 runs either.
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Old 11-29-2011, 03:46 PM
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Yes it can. You should be able to easily handle 500hp with a stock crank and block unless you are using NO2 which changes things as far as durability.
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Old 11-29-2011, 04:02 PM
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Like ap says, you're upside down in your recipe. If you're saying a 4.00" bore + .030 and 4" stroke, you're in the 409 c.i. range. If you're talking a GM 400 block + .030 for a 4.155 bore, you're talking a 434 c.i. motor. I'll venture a guess you mean 1.94" intake valves? And the pistons, whatever TPI's are, don't come rated in compression, only dome or dish volume and flat tops.

500 HP with a stock cast crank, rods and pistons would be pushing the limit IMO.
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Old 11-29-2011, 04:30 PM
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That's kind of funny there 68! Being a parachutist I always figured that being I was going to die anyway I would be looking for something to crash on to make people laugh when they found me!
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Old 11-29-2011, 05:02 PM
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Heck yeah, on the famous thing...my luck I'd land on a Kia or something, always wanted to jump though.
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Old 11-29-2011, 06:00 PM
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You need AFR227 76CC heads Then in can get the HP. The stock heads will not cut it.
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Old 11-29-2011, 09:29 PM
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406

The stock bore on a 400 SBC is 4.125". With a 0.030" overbore and a 4.00" stroke the displacement will be 434". The pan rails will have to be notched to clear the rods and the rods may have to be modified to clear the cam. You have a good chance of hitting water when you clearance the pan rails.

ANY production SBC head will kill this engine!!!! The wimp cam in this engine is so small that it would add to the head problem. Build a 406" with the cast crank, stock 400 rods with ARP bolts, and a cam about 250 duration @ 0.050"and about 0.550" lift. Run an Edelbrock AirGap intake with an 850 Holley and 1 3/4" headers about 32-36" long. Spend your money on a GOOD set of heads.

2 bolt block with ARP studs on the mains and heads. Stay away from the 4 bolt blocks.

MSD 6AL ignition w/37* total advance.

Hit it with a 100 shot of nitrous and it will scare the s**t out of you.

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Old 11-30-2011, 04:04 AM
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A 4" stroke will almost surely need to be half filled w/Hardblok to keep any water in it. Much better to use an aftermarket block w/a 4" stroke crank.

The biggest stock production SBC ports I know of are in the infamous swirl port heads, about 185cc, depending on who you ask. But they would be about the worst choice you could make for a 434 cid SBC engine if you wanted it to make HP.

As has been said- if you have a sound 400 block, build a 406 w/it (if the bore is good). Kits are readily and affordably available to build it w/a 3.75" stroke crank and 5.7" rods. Add a decent set of aftermarket heads and you can have 450-500 HP depending on the exact combo of valve train, induction and heads.
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Old 12-13-2011, 09:49 AM
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thank you everyone who acualy gave me good info instead of just telling me its going to blow up and NOT helping me out. im 18 and extreamly new to this i apoligize for not being up to snuff with my list but seriously was that nessesary.
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Old 12-13-2011, 12:28 PM
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Some friendly advice:

Quote:
Originally Posted by blakjak
thank you everyone who acualy gave me good info instead of just telling me its going to blow up and NOT helping me out. im 18 and extreamly new to this i apoligize for not being up to snuff with my list but seriously was that nessesary.
This type of forum has many guys w/differing outlooks on things. Take the good you find and concentrate on that instead of wasting a post whining about a response you don't like.

If you're new to building engines, do yourself a big favor and buy a book or two or hit up your local library for some info. One title that is often recommended is How to Rebuild Your Small-Block Chevy by Dave Vizard. Another is also by Vizard and is more advanced, How to Build Max Perf Chevy Small-Blocks on a Budget. More- http://www.amazon.com/David-Vizard/e/B001JOWD4M

Good luck.
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Old 12-13-2011, 12:38 PM
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Being young, my advice would also be to find someone who will let you drive a 300, 400, and 500hp car and see what you really need.

As far as builds go, 400hp can be vastly different build than for 500 hp. Be specific when picking your goals. 500hp is a LOT of ponies, especially in an older car that wasn't designed for it. Most people vastly overestimate that power they're running, and when they sit in a true 500hp car, are blown away by it.
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