spark plugs???

[tc1959]

I have been running AC Delco Rapid Fire # 1 for about 10 years I could feel the difference when I switched .The new ones are platinum tipped.

 

[olds307 and 403]

Run a cold plug. I just ordered a set of R5670-8 NGK's to try at the track. They are supposed to be a colder plug, suggested by a successful Olds racer. The higher the last number for NGK, the colder the plug. Most other plugs are made in China now. Autolite plugs have never let me down either.

 

[mheath717]

The only plug I have ever run in my Olds 350 are AC Delco R46SZ. I haven't had any problems with them. But then again they are all I have run, so I wouldn't really know any different.

 

[layedoutregal]

well im getting it dynoed inna few weeks and i will deff let u guys know the outcome,