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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