What are the heat range part numbers for Autolite plugs?
I have a set of AFR 210 cylinder heads and AFR recommends starting with AR3910 Autolite plugs.
I have fouled a few plugs while I try to sort the tuning...is the 3910 a cold plug or?
My local Autozone/Oreilly/Advance aren't any help especially these plugs are already special ordered.
In other words, how does Autolite number their ranges? 3920, 3930, etc?
1969 Nova SS 350
11.43 at 121 MPH
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