Sparkpug help
#1
Mopar Fanatic
Thread Starter
Sparkpug help
Im wondering what sparkplug to use in my plymouth ,it is a 1965 belvedere with the 318 poly engine and has a four barrel carb.i think this car only had a two barrel carb from the factory ,what would be a good plug to use.
Thanks for any advice
Thanks for any advice
#2
Mopar Lover
the champion J14Y was the original plug. I've heard some good things about the NGK plugs. (I always used Autolite plugs in the old days) NO AC's in a mopar please. Got extra dough burning a hole in your pocket, try some Bosch Platinum's. [Just cross reference for the correct number plug]
#6
Mopar Lover
I guess you would use the same plug for the 4bbl in your case. The reason is because the compression ratio has not changed. If you had the hp motor you then could try experimenting with a colder plug (like the J12Y). The colder plugs were used in engines that made more heat I guess to try to prevent preignition in the combustion chamber. I remember it like this. Hot motor-cold plug. Cold motor- hot plug. Mostly this is all old school stuff. I doubt it matters unless you have a race car especially with the new ignition systems available today.