MRMOPAR570,
I have never run Champion spark plugs in my race car.

Quote:

I was running last year's Autolite AR3933 plugs that had 23 runs on them. I have a new set of NGK R5671A-9 ready to go.


In the past I have also run the NGK plugs with the projected tip, such as R5672A-

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1