351 numbers

[jwd]

I'm new to Ford's number system. I'm looking at a 351W that has a casting number of D4AE-6015-AA-13 and a casting date of 8C14. To me, they don't make sense. One says it's a 1974 and the other says it's a 1978. Please help. Thanks.

[Woodz428]

The D4 is the casting # of when that incarnation was first used, the suffix #s designate changes to the original casting. The date code is actually when it was cast. So it was cast in 1978 and would make it a 1978 block.

[jwd]

Thanks for clearing that up.