here is my projected tip -5 ngk, has some carbon on it , but I would expect that, they have been in there since day one, 4000 miles, mostly street , seven 1/4 mile passes in the heat of summer & no detonation. like I said 512,9.5 comp , small solid.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
