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770 Puller, I'll expound on your question regarding WC RPMs, etc. 33 Massey Harris, 4 cyl. 201 CID. 1950 rpm per NATPA, 1700 (same CID WC came out with) 77 Oliver, 6 cyl, 194 CID 1750 rpm per NATPA, 1750 (less CID than WC came out with and 17% smaller then WC's are allowed) F-20 Farmall 4 cyl, 221 CID 1200 rpm per NATPA, 1350 (AC D-17 [ WC, WD, WD45,] 4 cyl, 226 CID, 1650 rpm, per NATPA, 1995) NATPA Div. III rule exerpt: Tractors must have the stock engine, frames, transmission, rear end and axle housings or manufacturer�s replacement. AC - WC/WD/WD45 can use D-17 engine. The above are excluded from Div III 3500# and 3750# classes excepting the WC, WD, and WD45. Another glaring example is the 88 Oliver that came out with 231 CID and is limited to 4500#s and up. I couldn't easily locate the 10-20-McCormack and JD's are an entirely different animal but I think you get my drift, and NATPA's "aroma." The following paragraph is right from NATPA's rules: It includes the phrase, "like sized tractors" which appears to mean if the AC rules dudes LIKE a tractor, it pulls light, if it may beat the AC boys, you're screwed. Most organizations that I know of, and I pull with several, do not use rules to help or discriminate to benefit the "wheels." These guys take the cake. 14. OL 66,Farmall H, AC WC, Ford 800, Cockshut 30and above and like size tractors are not allowed in classes below 3500#. Massey 33, Oliver 77, JD-A 1939, McCormick 10-20, F-20 and down and like size tractors are not allowed in classes below 4000#. Oliver 88, Farmall M, Massey 44, MM-U, JD-G, Case-C/D, JD-A 1940 and up and like size tractors are not allowed in classes below 4500#. Massey 55, IH W-9, IH WK-40, Case LA, Case 600, Moline GB, Moline GBD, Oliver 99 and all like size tractors are not allowed below 5500#.
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