what is the recommended spark plug, for this application? b-20 block, with je pistons 9.0 to 1. A gsr head heavily ported with oversized valves (.5mm) over size, extensive port work, 534 cc injectors, a jackson supercharer @ 11psi. ( still trying to come up with a way to cool down the intake charge, but i know i cant go with stock gsr plugs. what heat range are you guys using for boosted applications?

 

7-8