VCCA Home Forums Thread Like Summary - Spark plugs

I’m going to replace the 25+ year old plugs in my 33, as it’s running very rich. Currently there are AC Delco 43’s in place, I plan to jump up to 44’s. My local Auto Parts store has AC 44’s, but all options have various letters following the 44 (44T, 44TS, etc.). Are these ok to use? Any I should avoid?

They’re going on my 33 1.5 ton truck, 207. Plan to gap them at 28-30

Thanks,
Adam

I would not use the 45S which has the extended tip...........actually it should be the AC R45 - R is for a resistor type which all are today,