I believe the motors are externally identical. My '55 1st had a 248 from the factory, but now has a later 270. It looks like it grew there.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...