Spark plug gaps

go-fish said

Do me next!

1973 Duster 340, stock piston/cr, 222 SFT, LD340, stock manifolds, MSD Ready to Run distributor, MSD coil.

I’m using #4 Autolites with .038” gap.

Am I on the right track with colder plugs on low compression iron heads? I went a little more gap to get a bigger kernel.

@pittsburghracer @RustyRatRod

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I already told you where I’m at and I run an MSD7AL3. My 72 (340) duster came with electronic ignition. When I told out local Mopar guru that I had to climb a local hill and jump on it in third gear and get two backfires out of it these were his words. Get rid of the damn Champion plugs and put Autolite plugs in it gapped at .028. 40 plus years later I’m at .030

This happened back in the late 1970’s