Small journal early 327.

As old motors go its a relatively desirable one. I believe the 512 casting was used in trucks and as a replacement so it may be original to the truck or been put in later. Google would likely confirm or deny that.

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...