What is the difference between the 1972 Stage 1 heads and the standard 455 heads as it relates to the casting numbers? I have a set of heads on my engine #1238148. The engine is not the correct year for my car; however, I may rebuild it to trade for a 1971 when the oppurtunity presents itself. There was a link on line that gave all the casting numbers and their usage. I think the heads were the same in 1971 (valves are different of course) but I don't remember what the 1972 said. Thanks for your help. Len
Casting #'s are the same for standard and Stage1 heads, any year, I believe. Stage 1 heads are standard heads opened up to accept the bigger valves.
1231738 (455) 1970 & 1971 1238861 (455) 1971 These are the two casting numbers shown for 1971 455 blocks. Does anyone know if there is a difference between the two blocks? Harvey
Thanks. I saw that site today; there is another site that has the Stage 1 blocks also named. I also believe they are the same castings. Len
One is probably a single scallop, the other is double scallop with different core holes. You just need to watch which head gaskets you use.
