Spark Plug Heat Shields

[cadillac_al]

I always took them off and threw them away all my life. They got in the way of plug changes and cut my fingers. If I got a truck with them today I might leave them on and rough it on the plug changes. I don't think they are really needed though. When I used to mud bog my K20 the spark plug area would get caked right full of mud and the exhaust manifolds held it in there nicely. The truck still purred like a kitten without a misfire at all. So yeah spark plug wires are a lot better nowadays.