Post the codes shown on this page.

1. Block casting code
2. Block casting date
3. Engine Serial Number
4. Head casting code
5. Head casting date

The Blue Flame Six was the name of the high pressure 235 used in cars, starting in the 1953 Corvette. They were painted a light Blue. From 1954 onwards they were available in all models of cars. If they came in a non-Corvette car with a Powerglide transmission, they had hydraulic lifters.

The standard 1952 small truck engine would have been a 216. It would have had mechanical lifters and it would have been painted a darkish gray.
All Chevrolet trucks had manual transmissions until 1954.

A 216/235/261 engine might have been a light blue (Blue Flame Blue) by a rebuilder.