I built a 13:1 compression Dove headed 466 to drag race. I called NGK for a plug recommendation and they said I needed a 7909 which is a 8 on the heat range. But it won't go in the head because of it not being a tapered seat. NGK says they don't make a plug for me so who does or how do I get the right heat range recommended by the machinist and NGK?
I knew you would have the right answer Scott! What plug does most people run in the early heads in that heat range after getting this adapter?
I'll order the adapters tomorrow and I appreciate the help!
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