Aluminum Head Identifying
Just cleaning my shop up and found a set of heads i have had for years. They are alum. GM PART #3946074 has round exh. port it looks like a date code of 42572 I think ? it is under the ports. they are in nice shape are they any good and is there any value to them ? I loned out my chevy. by the number book to some one and never got it back . Any help ? THANKS
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