I ordered a 903 thermostat and the one that came in dont look anything like the one in my truck. Well its begining to look like I dont have a 903 afterall. On any engine, a common place for numbers is below or behind the head mating surface, usually small stamped number on a portion of the block thats been machined flat and smooth.Sometimes on a Vee engine the numbers will be at the very front or very rear top edge of the block between the heads.It wont take much grease to hide them no matter where they are.Steam clean it or grab a rag and some degreaser ( thinner, brake cleaner,ect. What kind of tractor is it in ?.The V265 was real popular in short cab/short wheelbase units. I think Cummins guy is right, youve probably got the short stroke engine, probably a V265.Ive never seen a V903 without the numbers cast into the rocker covers, but they might have made blank covers.Not sure what year the 903 started, but I'll agree that its probably later than '66. There were two big bore class 8 V8 cummins, the 785 series and the 903 series
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