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Tractor Pulling Discussion Forum

Re: SD silver diamond

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Author  [Modern View]

12-20-2012 09:01:25

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what years were the strait valve motors? how bout the tilt-valve?

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12-20-2012 10:36:51

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 Re: SD silver diamond in reply to 560gaspuller, 12-20-2012 09:01:25  
thinking they changed close to 47-48 to the tilt valves. ive never traced back how far the sd motors go in the trucks n dozers, the 6cyl of that whole line could date back to early 40s. seen 4, 49 model IH trucks that all had tilt valve heads on em.... gotta be pre 48 to find one.

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12-22-2012 23:12:51

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 Re: SD silver diamond in reply to ss409, 12-20-2012 10:36:51  
The SD engine began production the same time as the L-series trucks...about November of '49, for 1950 models. The SD engines only came as the SD220 and SD240...same bore, different stroke. Only when the tilt-valve BD's came along--and IIRC, the tilt-valves weren't until '58 or '59--did IH go as big as the BD264.

The so-called BD308 and BD282 were simply variations on the old BLUE Diamond engines, and were not designed off the SD or "true" BLACK Diamond engines. The BD220, 240, and 264 became the BG221, 241, and 265 when equipped with PCV valves instead of road-draft tubes for crankcase ventilation...and ended at the end of 1968 truck production. 1969 and up IH light truck sixes were purchased from AMC.

Not sure what "tilt-valve" engines YOU'RE talking about...but it sure wasn't anything in the SD or BD line of engines. Maybe the Red Diamond engines were "tilt-valve" engines...but their parts won't interchange with an SD engine any more than the Blue Diamond engine parts will.

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