whats a good recommend spark plug gap for my car i have 87 4 blot main 355 wit 10.5:1 compression new 22lbs injectors running at 55 psi wit the Fuel pressure regulator. iv tried .035 ran like **** right now im running .025 gap an still runs like **** c if anybody had better suggestions then keep tryin different sizes over an over til i get it right

 

I'd go bigger man, not smaller.

AFAIK the gap is usually decided by the ignition system you have, not necessarily any other mods, though don't quote me on that.

For instance, the stock motor that was in my car used plugs gapped at .035", but with a 350 and my MSD ignition system, I gapped them to .045"

And just throwing this out there, the running like crap may be something else, and the gap may be fine, in actuality!

 

i dont know for sure i know for turbos u wanna go smaller so id thought id try that