580 CK with a 159 Cubic Inch Gasser Engine Plugs?

rasman57

Member
Rebuilt 159 gasser in my old 69 Case Construction King Backhoe loader tractor. Runs a bit rich with an aftermarket new Zenith carb. I have leaned it out as best I can but the plugs seem to get a bit sooty and fouled. Any recommendations on a good spark plug to run with todays gasoline?
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