i just ordered the dart iron eagles straight plug, and it gives a champion number ot use for a spark plug. but i like the rapidfires. im currently using the #1 plugs in my engine. the heads say .460 reach and tapered seat. will these plugs still work fine, or will the champs have a little more power or smooth ness?

 

it's been a while but i built a 355 with the dart heads and i think i just swapped the standard plugs from gm heads to the darts. the .46 reach tappered seat sounds like a stock plug.

 

I use autolite 26's in my dart heads, standard plug.

 

ok, guess ill go with my normal plugs then. rapidfires #1