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-   -   Different Engine Case Numbers (http://forums.pelicanparts.com/911-engine-rebuilding-forum/996704-different-engine-case-numbers.html)

tlholliday 05-16-2018 03:22 AM
Different Engine Case Numbers
 
Question for anyone - I bought a '72 2.4L MFI used engine to rebuild. After tearing down the engine I noticed that one engine case is a 3R and the other is a 4R. Is this normal? Or is it more likely someone replaced one of the cases?

Thanks

Flat6pac 05-16-2018 03:37 AM
Odd and even, right and left.
There is a set of numbers on the top centerline that are on each side to show a matched case.
Bruce

Luckyboy 05-21-2018 06:37 PM
You will need case line honed if it’s not a match.
Pedro.

Steve@Rennsport 05-22-2018 12:38 PM
Quote:
Originally Posted by Luckyboy (Post 10045669)
You will need case line honed if it’s not a match.
Pedro.
The case halves should be machined flat and line honed, no matter what. :) :)

djpateman 05-31-2018 04:33 AM
The 3R / 4R combo is normal, so no worries there. Just be sure the mating numbers on top match. Here is my thread on case revisions:
911 engine case Revisions
Please PM me with all of the numbers on the case to add to my database.
Steve's comment is very important.


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