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Discussion Starter #1
Ive just got my new set up running. I was blow through on c16 around 25+ psi, 8.5 to 1, track car, using a 9 heat range plug. Now ive switched to EFI, Holley DIS, and still non intercooled running pump gas (94) around 10-12 psi and more of a street car. I've searched and think I should be going with a ngk 5671-8? Does that sound good? Also its a 400 inch motor with a F1R
 
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