Join Date: Nov 2004
Location: San Rafael, California
Spark Plug Gaps
I've got a new Goodwrench 350, mild Crane cam, Performer intake, Q-jet in my '75 Camaro. With the old stock motor I always ran AC R45TSX plugs with .060" gap (stock specs) and never had a problem, always ran strong. I'm still using the original stock HEI ,which has never let me down, on the new motor and am running AC R44TX plugs, also at .060 gap. This motor runs like a champ, healthy and strong. GM only used the .060" gap in '75 for emissions and then went to .045" gaps for HEI's after '76. Here's the question: I've always thought that the bigger the spark gap the more power; is it possible I could get even better performance if I switch to the smaller .045" gap?