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question on swapping SBC400 to 350 heads

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Old 07-10-2002, 03:25 PM
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Default question on swapping SBC400 to 350 heads

My heads have leaky valve guides and does not have harden seats. I have a fresh set of 350 truck heads and was thinking about putting them on my 400 block. What do I have to change ? ie: what Head gasket do I use a 350 or a 400? What about the stem holes? The 400 heads are out of a 1970's car and the 350 heads are out of a early style 350 ( larger holes for the assories) truck. I know i will have to drill out my brackets but mostly don't know what gasket to use. Any help or insite would be great

Rick
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Old 07-10-2002, 03:31 PM
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You will need to use the 400 gasket, and drill the steam holes(you can use the gasket as a template). The performance characteristics or the engine may change. The 400s typically used a larger cc head then the 350. You will most likely see an increase in compresion.
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