Thanks, Grigg. I probably should have called you to start with. This is what I had determined a few weeks ago. Chevy offered the 4-53 (212 inches) and the 6-53 (318 inches) beginning in 1962. In '68 and '69 they offered a 3-53 and a DH478. Then beginning in 1970 they offered the 12V71. I have no idea what a DH478 engine is. Do you? Could it possibly be some other make than Detroit; like maybe Cummins?


Last edited by jay 1124; 11/07/2007 2:02 AM. Reason: add a word