I know this has been covered a thousand times, my apologies in advance.
I have a stock L31 Vortec long block with a TBI mounted on it. 94 Chevy C1500.
I am currently running AC Delco R44LTS plugs, and reading the plugs, I would like to step down a heat range or 2? I am getting knock retard also, so am hoping a colder plug will help.
AC Delco for some reason quit making the R43LTS plug, I can still get the Marine MR43LTS (any difference other than being Marine version?).
Next step is R42LTS.
How much difference would 2 heat ranges make? (as I said, reading my plugs, I can go down in the heat range).
What are you guys running in your Vortec TBI motors?
Not a fan of changing plugs with the damn shorty headers in the way, so would like to get it right the first time.
Any advise and insight is appreciated.
Thanks
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