AC-44 or 46. Gap= .035"

The only reason I'd try non-foulers is if the engine were fouling-up a plug very quickly.

I'd try a higher heat-range plug first.
If the hotter plugs foul, then the engine is probably using so much oil that it needs to be overhauled.
That's been my experience anyhow, with 216s and 235s.


Frank McMullen
1941 Chevy dump truck
1949 GMC 100 pick-up
1954 Chevy 3600 pick-up
1955.1 4400 dump truck
1941 De Soto & other MoPars
1928 Model A F**D Special Coupe