I bought a used 197? 360 that supposedly came out of a motor home. It is a 2bbl, has no air injection holes in the heads, has a egr,. I opened it up and is is really clean inside. It has been apart before. I have not pulled the heads. I did pull the oil pan as I have to install a car pan. On the crankshaft, after the #2 main, it is stamped R X 3 4 in 3/16-1/4 letters. Any idea what this means? I have always seen 010 or 020 if it was cut. I did notice it has a hv72 tag on the oil pump, so that should be a high vol oil pump. I am planning on pulling the heads, swapping the cam, valve springs, and timing chain and running it.
Crankshaft markings
- Thread starter B-onefan
- Start date
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Not sure what your particular markings mean. Do some research and measuring. My father was a Chrysler mechanic in the 70s and 80s. Apperantly a lot of early and mid 80s 360s came with 001" bearings. Sometimes one shell was standard, the other was 001. It was a common warranty practice to put 001 bearings in when a customer would complain of a noisy engine. I have 2 of these warranty fixed engines now and they still run fine. Apperantly Chrysler was getting cranks made and machined in Brazil for awhile. Fine for a passenger car but horrible machining!!! They refered to them as RUBBER BAND cranks. Mostly in early and mid 80s 360s from trucks and motor homes
After I came in and cleaned up, I got out my Mopar small block book and started reading. According to it, the R X stands for .010 on all rod bearings and the 3 4 stands for rod journal 3,4. So I am not sure if all are .010 or just those 2 rod journals are .001. I will pull a few and check them.
d55dave
Well-Known Member
If it has been apart and rebuilt previously it likely has been turned and therefore means nothing anyhow... pull a few caps and look at the backside of the bearing shells for oversize markings.
694spd
Well-Known Member
This is a picture showing the stamp on the crank from my 69 340 Dart. My understanding is that it indicates the rod bearing on the 5/6 rod journal is .001 under. I measured all of the rod journals and the 5/6 was found to be .001 under.
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