Quote:
Originally Posted by Billy Nees
44,44S and 45 are pretty much smallblock Chevy plugs. The 46N is for 62-70? 6cyl Chevys.
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Billy's right on the money, above. The 302 Z28s specified 43 heat range, but it almost always proved to be too cold, so many Z28 owners migrated to 44 (for occasional WOT blasts) or even 45 plugs (for low-speed idling/cruising). Same story for Corvettes with engines like 327/365. Somebody will want them.