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Old 03-01-2013, 10:31 PM
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sbc help?

I have been wanting to start a build and I have no clue on a engine to start with I have thought about building a chevy 302 but I have 400 sbc that needs to be overhauled and I have been thinking about it. I have heard of a 409 sbc but I have no clue about it. I know what heads and everything I want to use I just don't know about what block to use IM just wanting a hot street engine I would like somewhere around 425 at the crank. Thanks

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Old 03-01-2013, 10:59 PM
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Originally Posted by jrbaker View Post
I have been wanting to start a build and I have no clue on a engine to start with I have thought about building a chevy 302 but I have 400 sbc that needs to be overhauled and I have been thinking about it. I have heard of a 409 sbc but I have no clue about it. I know what heads and everything I want to use I just don't know about what block to use IM just wanting a hot street engine I would like somewhere around 425 at the crank. Thanks
If you have a good sbc 400 block, that's what I would build.

A 400 bored 0.030" is a 406, bored 0.040" it's a 409, and bored 0.060 it measures about 413.

There are other ways to get different displacements. Using a 350 block bored 0.030" and a 400 stroke crank (3.75") gets you a sbc 383 stroker, which is a very popular combination. There are many other combos. But the basic rule is there's no replacement for displacement.

A displacement calculator is here if you want to play w/bore and strokes.

Longhand use: Bore X Bore X Stroke X .7854 X The number of cylinders = Engine Displacement.
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Old 03-01-2013, 11:04 PM
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what cylinder heads are you going to use for the street? 425 horses is not that much for a 400 but some heads do not flow enough...
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Old 03-01-2013, 11:10 PM
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street engine

choose the power you want,you have heads? ,do you know how many cfm they flow @.500?
Use a 750 cfm carb
a roller cam will make more power than the flat tappet

Last edited by vinniekq2; 03-01-2013 at 11:30 PM. Reason: wrong
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Old 03-02-2013, 09:46 AM
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I have been thinking of a set of vortec I really ain't decided on it all yet I have been looking for a block and I Ain't thought of much else. The motor is in a gmc camper it has a 4 barrel carb. How is the chevy 302 and what hp could be got from it vs a 400. I heard the 400 has cooling problem
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