I have some 350 and 455 heads with different numbers,can anybody give me a clue what they are as far as year and cc's 350 1237650 1243452 455 1238148 1241860 I also have some seat belts,what do these codes mean 50A71 03A71 15A72 thanks everybody you're the best
Casting numbers usually differ from part numbers. Ex: '71 455 heads P/N 1240144 casting number +/- 1234567( not a real # ) '71 455 Stage 1 heads P/N 1240146 casting number +/- 1234567 Both will have the same casting number, but since they have been prepped differently,they will each carry a different P/N. Others here can fill you in on any obvious or discrete differences. Oiling & cooling passages,for example, may differ from year to year.
350 1237650 = 1971, 58cc 1243452 = i'm not crossing this at all in either the big or small block numbers, not even for a replacement head. typo? i don't have all of the small block casting numbers either though.... 455 1238148 = 72, 71cc 1241860 = 73 or 74, 71cc you're on your own for the seatbelts. p
