I took the guy at his word though did find this after your reply:
List of Cars With a 502 Engine | It Still Runs
"The
Chevrolet-produced 502 is a big block V8 with
502 horsepower and 565 ft-lbs of torque. Originally designed for racing Corvettes
in the early 1960s, the engine was eventually produced for consumers in 1996. The 502 engine is sometimes called the
Ram Jet 502, referring to the Ram Jet fuel injection. The 502 engine is a very popular crate engine today for hot rodding and drag racing".
I didn't interrogate/challenge him. Based on the reference, I would have came out the fool.
Doesn't really make that much difference. Cool truck just the same.