[Formulajones]

Originally Posted by 77 TRASHCAN

X2!!!
My engine builder (of course he is a Chevy guy) always used small gap plugs, gapped at .035, in ANY engine, he also liked the non projected tip plugs, when available per application. He liked to keep that small piece of nearly always, molten petal away from the piston top, just a little bit more...

That's where I differ a bit. I've always liked the projected tip plugs and relied more on my ability to provide a safe tune that won't melt the plug. Now if I were running a bunch of nitrous I'd rethink that but for N/A, projected tip is fine.

Most of the knowledgeable people I was around referred to the non projected tip plugs as "oil burnin plugs" LOL Kept the electrode out of the path so to speak. The projected tip got the spark out into the mixture where all the action was. So that's what I use on all the street cars here.