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  • Users: Heptec
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  1. Heptec

    New Sealed Power Nissan 300ZX intake valve coating remove?

    Should I grind the intake valve faces and remove the black coating or just instal them as is. I chucked them in the grinder and they show no runnout with a last word indicator (0 to 0.001") and the finish is visually smooth using a 500x surface comparator.

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