Why are you using Autolite plugs in a GM vehicle? I have always used what the manufacturer called for due to variations in heat range across the brands. If I am not mistaken I believe Chevrolet engineers called for AC plugs.


"Pay attention to the details! It ALWAYS pays off."

1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle