I originally posted this at
Steve's Nova Site, but since it's not the original engine, and apparently a truck engine to boot, I couldn't get much help. Here's the info I have:
It's in a '63 Nova SS and the guy I bought it from told me it's a 250, so obviously not original. Here's the code and serial from the pad behind the distributor:
F0524TAC
C4F455981
Block ID is 348675
I think it's a 250 from a '74 truck, but all the web sites I can find only list V8 codes, so TAC doesn't turn up anywhere. I'm pretty sure the F0524 means it was cast in Flint on May 24th and the T makes it the GM Truck Division. Three letters should make it post '70, but the serial doesn't seem to be formatted properly. At least according to the way V8 serials are supposed to be formatted. Do 6's have a different format? My guess is that the first 4 makes it '74 and the C and/or F confirm Flint.
I'm hoping someone here has a good truck book and can look this up for me. In the mean time I'm off to the library to see what they have on the shelf there to help with this.
I'd really appreciate any help y'all can give me.