Original Message
Clues
By Royce Peterson - 10/15/2002 8:45:47 PM; IP 64.12.96.170
There should be a date code by the oil filter mount.

There should be a hand scratched character on the rear bulkhead where the transmission mounts. Examples from my garage are:
"D" = 64 427 center oiler
"e" = 65 side oiler
"F" = 68 side oiler hydraulic lifter
"g" = 69 service replacement side oiler (I bought this one brand new as part number C8AZ 8015-G)

There should be cross bolted main caps.
The presence of the 427-66 on the rear bulkhead is meaningless. 390's and 352's also have that marking in some cases. The 427 in the lifter valley is a good sign, I have seen a lot of FE blocks and only 427's have so far been marked like that.

Other 427 only characteristics include screw in freeze plugs on 65 and later blocks.

Note that I am only talking about the most common 427 blocks which were originally installed in passenger cars. There are oddities from irrigation motors and boats that might have some or none of these characteristics. Also 406 service replacement blocks from 1964 - 66 were evidently made with 427 block tooling. Which in my mind makes them just as desirable.

Hope this helps, don't hold me accountable if you get ripped off buying a fake one.

Royce Peterson
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 427 block ID -- ErikB, 10/15/2002
Clues -- Royce Peterson, 10/15/2002
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