03-26-2015, 09:05 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
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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