Could someone show/tell me where on a 421 block the engine code is?
 

Going to pick up a car and look at a couple of 421 engines. I am trying to figure out where the engine code is on the block to tell what version it is. Thanks

Passenger side of block up where the head mates.


https://forums.maxperformanceinc.com...1&d=1697663580

The 6 digit number could be below the engine code on the early blocks.

:)

Here's a pic of a 1963 421 codes


https://forums.maxperformanceinc.com...1&d=1697663783


135U is the block code


:)

nice pic of the 421SD . do you own the car it belongs to?

NO.
The pic probably came from here? or internet for sure.

From my notes:

http://forums.maxperformanceinc.com/...=1#post6372605


:)