I searched and read a couple different threads on spark plugs, but did not see this addressed and would like some guidance.
Finally got to make a few passes this weekend with a 496, alky, Merlin iron heads, 8:71, around 6 lbs of boost, SM3 (hopped up by Spud) and built enough heat to read the plugs. (a little lean)
Not sure if I am ahead or behind.
Running a Champion 670 v59c picked up cheap from one of the guys with a similar combo.
Not a fan of Champion and always ran NGK with my inject small block.
Gapped at .016
I do not know enough about heat range to pick what I need, so what heat range do I need? NGK R5674-10 or do I need to go to a hotter -7?
Are the heat range number standardized between brands? bigger# is colder?