Reply to "Spark plug"

panteradougMember

That is the correct heat range but it is the larger diameter plug and would be used in the 60s FE's and small blocks.

You need an AFR9YC. That's a Champion plug. Unfortunately they are the only ones with an accurate heat chart. Unfortunate because they are the "cheapest" of the plugs.

A 42 heat range (from the Motorcraft chart) will work and stay cleaner then the 32.

2/23/1311:46 AM

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