I've run an SM420 for 50 years with no seal. It doesn't leak as far as I can tell, even when parked nose-down on a steep hill. Does yours leak now?


1951 3800 1-ton
"Earning its keep from the get-go"
In the DITY Gallery
1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.