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Old 05-23-2012, 10:41 AM
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i need help building a 406 please help me!!

ok guys I posted on here lastnite which was my first time and I was goin to do a 383 but a couple guys told me to go with the 400 and make it a 406..but this will be my first time doing anything like this and I need help on goin with a set up I'm looking to get about 400hp and its goin to be a street car..I have access to a couple vigin 400 blocks so please can you guys tell me everything I need to do from start to finish I know some of the things I need to get but I don't really know the specs or anything like that so can you guys give me some good advice and good parts to get and the websites to buy them from..I'm not lookin to rush this project by it bein my first time doin this and I have wrote down a lot of notes on it already I just don't have any good set ups or parts or anything like it so PLEASE HELP ME..

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Old 05-23-2012, 12:38 PM
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Find a local qualified engine builder/machinist. Take the block to him and have him inspect it to see if it is rebuildable.

Discuss the build plan with him. DO not run out and buy parts on a wim.
Get a plan and work it with the builder. You will not save money by being a fool, buying the cheapest junk.

Build a 406 with new GM or Scat 5.7" connecting rods. Use a GM 400 crank or a good aftermarket (scat) 3.75" stroke crank. Can be a cast crank
The GM stock 400crank is plenty strong with proper prep.

Do no build with more than 10.5:1 compression ratio .

64cc heads use a -18 to -22CC dish piston
70+cc heads can use a flat top piston. -7cc

Do no use a dome piston.
Pistons can be hyper cast or forged.

Let the machinist select the specific engine kit.
The crank will need to be balanced.
A external balanced crank is fine. ( uses a external balanced fly wheel and balancer)

Get some good cylinder heads if you want power.
Dart, Brodix, Edelbrock. Profiler, AFR, etc.
Do not goof up the piston and combustion chamber size match up.
Most builders like to start with bare heads and finish them in house with quality parts that match the camshaft choice.

Do not run out and buy a cam. Plan your build and buy a complete matching cam and kit.

I'd go for a retro fit HYD roller cam and kit for this 406.

do not try to combine a flat top piston with a 64cc head.
The cr will be way too high.

The 400 block may need minor clearancing for the 5.7" rods
GM type rods will need clearanceing to clear the cam.
You have to have the cam on hand to do that or a suitable mock up cam.

Be prepared to spend at least as much as a 383.
The 400 block will need full prep and machining.
The 406SBC will rock and is well worth the money.
A qualified builder will ehlp you with the details.
10:1 cr is plenty. Do not get carried away.

The 400block must be checked for cracks etc before you start.
Thats where you start with a good rebuildable block and a good engine builder and a good build plan.
They are not all usable.

Last edited by F-BIRD'88; 05-23-2012 at 12:56 PM.
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Old 05-23-2012, 12:49 PM
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ok thanks for the info..
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