Hi. I had my race car engine rebuilt and unfortunately my favorite machinist discarded my old plugs and I don't know what they were.

Its a 2002 acura K20a2 motor with 13.5 compression, moderate cams and built to run on E85. It of course has a header and a low restriction muffler.

Wondering how different they might need to be compared to stock?

Is there a website out there for calculating what plug to use?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.