For the heads and cam guys what plugs are you running and what gap??? Would there be ny benefit to going to a lesser gap on a cammed car????
I am running tr55's right now......050 would I gain anything going to say a tr5 .035 gap ??????

 

Delco Rapid Fires @ .050.Its only been together for a little while,hasnt missed a beat,and running strong.I think the larger gap is better,unless you spray.You get stronger spark.

 

I'm running NKG TR55 plugs gapped @ .050. No problems noted.

 

Champion copper plugs .050 gap.

 

Yeah, I'd say the larger gap is always best until you get find the point where the ignition can't keep up. This way you'll get the biggest/strongest spark.

You could probably go .055 or .06 with an aftermarket ignition/coil on an NA engine.

I run .038 but I run up to 150-shot of nitrous. I plan on upping it to around .043-.045 to see if it works.

 

AC Delcos at .050 work for me and my buds car (he has heads and cam)