| Danny, My F motor - original block - has been rebuilt with hardened valve seats so I don’t use a lead additive. I do add a few ounces of Marvel Mystery Oil with every fill-up. Run the highest octane available 91/93. Ethanol free gas here in the Chicago area is only a pipe dream, so only running the corn gas. I do have an electric fuel pump, that Joe Jordan installed, mounted just fore of the gas tank and that helps a lot when the car has been sitting more than three days. Otherwise, as has been said here, it takes extended cranking to fire it up. Since I bought the F 20 years ago it’s had no butterflies in the heat risers so that’s a non-issue - whether I’ve fired up the motor in 10 degree or 90 degree temps to take it out for some exercise. Certainly takes a little longer to warm it up when the temps are sub freezing. Noel p.s. I started adding the Marvel Mystery Oil over 10 years ago after meeting a fellow displaying an immaculate black 300-G coupe at Iola, who highly recommend recommended it. I’ve never seen his G since. His business was building diesel engines of all sizes and said he adds Marvel to every motor. Sent from my iPhone On Jan 6, 2026, at 6:42 PM, dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
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