I recently acquired a pair of 327 double hump heads and have a casting # question. One of the heads is cast #3782461 and the other is #3890462. I’ve done a little research to try & find the differences between the two castings, and have found conflicting information. Thought maybe some of you experts could shed some light on my situation.
According to
http://www.mortec.com/ the 461 is a 62cc chamber, and the 462 is a 64cc chamber – my SBC rebuild book says they are both 64cc . . . anyone know which is correct? Can these heads be used together without conflict?? Thanks!!