Join Date: May 2017
Location: Bossier City, Louisiana
Re: Stock 1970 SBC spark plug question
That's only very slightly rich in my estimation. And I'd way, way rather be slightly rich than too lean. Lean = hot. I've seen melted piston tops from being too lean and in your case, I'd continue to monitor things and not change any hardware now.
I'd also change gasoline brand to a Top Tier fuel in a higher octane, as advised above. I'd also run only no ethanol fuel if you have it in your area. It's worth every penny of the 70-80 cents a gallon extra around here. My only problem with no ethanol fuel around here is that it is unbranded - I have no idea what, if any, cleansers or detergents it has in it. So I add some Chevron Techron from an auto parts store.
1970 El Camino under Reconstruction - 5.3L LS VORTEC Engine and 4L60E Transmission