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Old 06-18-2012, 01:58 PM
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502 heads on Gen IV block

Does anyone know if you cap put 502 Iron heads on a Gen IV (402) block?

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Old 06-18-2012, 02:23 PM
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Yes you can if you use the correct Gaskets-
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Old 06-18-2012, 03:48 PM
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But, why would you want too? 402 needs SMALL combustion chambers. Not 119+cc. 502's.
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Old 06-18-2012, 03:56 PM
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502 Heads

I have a new set of 502 heads, and was wondering which way to go, A new set of 502 (rectangle port) or an original set of oval port heads form a 70 Chevelle SS396 (350 hp) that need to be worked. The 502 heads look like they have bigger valves and similar combustion chamber. I have a 1970 model 402 with slightly domed pistons.
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Old 06-18-2012, 07:18 PM
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Streetability and response wise use the oval ports. The only way you could use the rect-port big chamber heads would be with a piston change to the 375 horse (or higher) pistons. Even then, with the big heads, the compression would be around 10-1 or less.
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Old 06-18-2012, 09:19 PM
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Thanks guys. Oval ports it is
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