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"I was not comparing, only pointing out that .060" plug gap was probably correct for his 93 chevy. And the "perfectly round" electrode was platinum. Hope he didn't put regular plugs in it?"

Challenger1, you are shooting from the hip and you are wrong.
Spark plug gap for the 1993 5.7 is 0.035".
The plugs were NOT platinum, I took them out myself. They were a standard AC conventional plug. NOT fine wire. The center electrode, which any fool will tell you is supposed to be sharp, was so worn it was hemispherical. The largest gap I measured was 0.072".

Put your hat back on your head and stop talking through it.

My point was even with worn-out plugs with a way-larger-than-recommended gap, there was no deterioration in performance (which wasn't that great to begin with, but that's another story).

Back in the first days (1975) of GM's HEI systems, factory stock gaps ran as high as 0.055". It wasn't too many years before they started bringing the plug gaps back to smaller numbers.

R.

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