I was wondering what kind of plugs are recommended for an 88 IROC 5.7 L engine. When I put my engine together I used AC R45 TS plugs,gapped at .035.I have seen 43 TS or something like that on my friends 91 firebird. What are the right ones? It is just going to be a daily driver so I just want to keep everything as factory as possible.

 

i would run ACDelco's at the factory specified gap

 

I know but which ones, I am running AC delco R 45 ts plugs now, but doesn't the 350 engine require to use 43 ts or something like that?

 

Today I heard from someone that ACDelco plugs come in 43, 44, and 45 ts and all I am trying to find out is which one I need to run on the5.7 L TPI engine.

 

um i own a 350 86 camaro. the use 26's