what fuel were you running before? Im at about 14:1 hi ports 540 and had run a 7 on e85, tried an 8 on c10 and then went to an autolight -10 equivalent on a recommendation, and wont go back down but thats on 110/112 octane. I beleive my plugs were glowing at 7500 and causing some issues that went away with the colder plug
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1969 carousel red firebird 455, richmond 5 speed
1964 540 gto
1971 lemans sport convertible
1972 Maverick under slow construction
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