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Cylinder Head ID


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1967-69 non-OAI 400/425/455 had C heads. There are both small and large valve versions out there. Big valve pieces found on 442, Toronado, and of all things most 2-barrel engines in my experience have had them.

Karl Sarpolis has a good article in this month's Journey With Olds on head identification.

I'm told there were a few sets installed on 1966 425 engines as "oil research" heads, which is a little odd as Olds used piston dish to change compression ratio instead of combustion chamber.

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