well if it's on a Chevy engine closed drive, it'll be the early SM420, if open drive, it'll be a post 55 version

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics