is there another NGK plug that is 1-step colder than the NGK 6510? i'd personally prefer something a step colder than a 7 heat range plug with high comp E85 and 15psi+ we run 7's on other motors up to 25psi, i'd just feel more comfortable with an 8 in there 1 should be fine at that, on e85 i don't think you need to go 2 until 20 or more
