.040 inch
The one it was built with. Champion RC12LC4
.040
Champion RC12LYC .035 gap
4cyl RC12ECC or equivalent 3.9L or 5.2/5.9 RC12LC4 3.7L OR 4.7L RC12MCC4
The plug is on the outside of the frame.
.035
All over the engine. There's about a dozen or so of them.
0.044 inch Champion RC9YC
My 92 has a 9/16 size plug My 1997 LeSabre has a 15mm drain plug.
you need new plug wires
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