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Old 01-19-2013, 07:48 AM
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I'm doing A 400 rebuild

I'm rebuilding a 400 ci sb. The heads were cracked and I have a good rebuilt set of 350 heads. They don't have the small steam holes like the 400s. Is there any way I can modify them to fit the 400 block? I have a friend who owns a machine shop and can do about any kind of machine work. Any info will be greatly appreciated. Thank you.

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Old 01-19-2013, 08:12 AM
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I'm doing a 400 rebuild

All you need is a set of 400 head gaskets. Here is a Wiki article on drilling the steam holes in the 350 heads. http://www.crankshaftcoalition.com/w...ck_Chevy_heads
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Old 01-19-2013, 08:51 AM
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with the price of after market heads so reasonable,now is the time to step the engine up?
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Old 01-20-2013, 01:50 PM
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Quote:
Originally Posted by cmb8065 View Post
I'm rebuilding a 400 ci sb. The heads were cracked and I have a good rebuilt set of 350 heads. They don't have the small steam holes like the 400s. Is there any way I can modify them to fit the 400 block? I have a friend who owns a machine shop and can do about any kind of machine work. Any info will be greatly appreciated. Thank you.
I'm currently running a 406 sbc, my cylinder heads were too thick to drill out the steam holes and I didn't find not having them to hurt anything...I talked to some local guys who have a lot of experience with 400s and they have never had any overheating issues or any issues not using the steam holes...If you can have them drilled for cheap, personally I would do it just bc GM did.

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Old 01-20-2013, 03:22 PM
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You didn't say which 350 heads you have but if they are the generic smoggers I wouldn't waste my time with them....even if you port them. Personaly I would invest in a set of aftermarket heads or Vortec's, don't have to be real expensive, just more modern combustion chamber and ports.
A good set of heads will make or break a perfornance build. Whichever you choose BY ALL MEANS, drill the steam holes, they are there for a reason or Chevrolet wouldn't have spent the time and money.
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Old 01-20-2013, 05:40 PM
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Cant the cooling hose be run over to the drivers rear, coolant fitting, on the intake? I heard that setup does not need steam holes.
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Old 01-21-2013, 01:20 AM
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If you have stock 350 cylinder heads they will fit and run but will end up holding back the HP and torque of a 400. Use an after market head maybe a 195 or 205 AFR or similar size head.
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