Quote:
Originally Posted by blykins
Heat range actually can make a big difference for street driven cars on pump gas.
For modern heads with 14mm plugs, I usually use an Autolite AR3924. For the 18mm variety, the Autolite 45's give me good results.
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Thanks very much. A follow up if I may, since I've considered that plug . In a 500HP 406 with Edlebrock Performer heads 10.5 compression, where would you gap them?