whats the difference between red and blue 253

[Kingsandman]

This motor came out of a hq panel van build date sep 74 qr high compresion stamp on engine prefix looks to be painted blue from factory or someone has rebuilt it and done a good job of repainting it.did high comp 253s come out of factory painted blue.

[Sandaro]

This motor came out of a hq panel van build date sep 74 qr high compresion stamp on engine prefix looks to be painted blue from factory or someone has rebuilt it and done a good job of repainting it.did high comp 253s come out of factory painted blue.

No, someone has painted it. What's the date code on the motor? Will give some indication if was original to that van.

[Kingsandman]

It came out of 1974 hq panel van sep build engine casting date matches build date 14j4 I didnt record engine no but its a qr block.ill post up engine no after work cheers.