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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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