Re: Cast iron or aluminum heads what do have?
Pull off the valve covers and get the cylinder head casting number. Well, only pulling one of is necessary. That will give you a lot more useful information than just the material type.
Although, they have to be iron. Aluminum does not rust like iron will. Aluminum is not a ferric material, so it will only oxidize. Basically get very dull.
Here's some SBC head casting numbers. http://www.kendrick-auto.com/chevrol..._number_re.htm
Hope I helped you out.
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