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TH
 
Join Date: Jan 2018
Posts: 10
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
Old 05-16-2018, 04:22 AM
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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

Last edited by Flat6pac; 05-16-2018 at 04:39 AM..
Old 05-16-2018, 04:37 AM
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Join Date: May 2018
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You will need case line honed if it’s not a match.
Pedro.
Old 05-21-2018, 07:37 PM
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Quote:
Originally Posted by Luckyboy View Post
You will need case line honed if itís not a match.
Pedro.
The case halves should be machined flat and line honed, no matter what.
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Old 05-22-2018, 01:38 PM
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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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Old 05-31-2018, 05:33 AM
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