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What type of Chevy Cylinder-Heads are 399899 1or y and 3873487 x?
Updated: 10/25/2022
Wiki User
∙ 10y agoBest Answer
Cast iron for a 307 or 350 unless they have 1.72" intake valves then its a 400 head
Wiki User
∙ 10y agoThis answer is:
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