what were the original spark plugs on a 68 z/28 mo engine? ac44, 45, or other? owners manual says ac 44 for 327, 302 not listed. I'm running ac 44's now.
The 1968 Chassis Service Manual (Specification section, Tune Up Chart) shows the standard plugs for the 302 was AC43 with the colder plug being the AC42-1C. It doesn't stipulate hotter.
Ed