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Discussion Starter · #1 ·
I recently scavenged a 351W from a 76 LTD in a junkyard to put in my 68 Mustang. Right now the block is getting machined so I don't have the exact number handy but I thought the casting # started with something like "C4AE" but I know for certain that the second digit is a 4. Does this mean this is a 74' block or is there a online decoder around that I can check out. I have noticed that when looking up some but not most engine parts the diff between 74' and 76' could be significant problem.
Thanks in advance
Lee
 

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The C means 1960- C4 would be 1964 and the next 4 digits denote part and the last letters show the design changes or updates.
D means 1970- D4 would be 1974 but an earlier block could have been used with engineering changes bringing it up to date.
 
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