07-07-2017, 05:25 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: 9,415
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Not Ranked
The 46's would be a hotter plug. I usually run the 45's as well with most of my factory head combinations. Autolite does make an "AR" plug in 18mm, but if this is a street engine, you're probably better off with the regular plug.
Post some pictures of a few of your spark plugs and we can tell you if you need a little colder heat range or if the 46's will be fine as a replacement.
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