M54A1 Posted March 15, 2016 Share Posted March 15, 2016 I've got a 1971 R685 which originally came with a 237, but the current motor has a tip turbine/ intercooler. The motor doesn't have a tag riveted to the block, and there is no stamping on the timing cover in front of the injector pump. The injector pump is also off of a 237 according to the part #. I have the heads off, getting rebuilt along with the injector pump. My question is, could this have been a Mack short block at one time, and is there any other way to tell what particular motor I have. While it is apart I'd like to have it built to a 285, if there are any differences between the 237 and 285 besides the tip turbine intercooler. What are yall's ideas? Quote Link to comment Share on other sites More sharing options...
M54A1 Posted March 15, 2016 Author Share Posted March 15, 2016 Correct me if I'm wrong but, I believe the 285 had main bearing girdles, are their any other differences? Quote Link to comment Share on other sites More sharing options...
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