CLASS RACER FORUM - 1971 487 X Heads

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Jim Cimarolli

06-07-2024 10:08 PM

1971 487 X Heads

Does anyone know when GM started heat treating the exhaust valve seats on their cylinder heads?

Dwight Southerland

06-08-2024 04:44 PM

Re: 1971 487 X Heads

1971 with the introduction of unleaded gas at the pumps.

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