The engines closest to the 263 in the IH truck line are the Silver Diamond ['50 to around '55 or so], Black Diamond [but only the 220, 240, and 264...the BD 282 and BD 308 are closer in design to the old Blue Diamond line of engines], and the BG 221, 241, and 265 engines used up through '68.
The Silver Diamond engines are all "straight-valve" engines, and use a narrower valve cover than the "tilt-valve" engines. Black Diamond engines could be either straight-valve OR tilt-valve engines. A straight-valve head seemed more prone to dropping exhaust valves than the tilt-valve engines, but that's only what I've been told. And a straight-valve head on an engine with tilt-valve pistons will yield around 12.5 or 13 to 1 compression with no other changes, according to the experiences in mix-and-match of one member of the OldIHC.org discussion boards.
But how that compares to what effect you get when swapping one of the truck heads onto the ag block, I really can't say, as I never got the chance to try it.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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