The UB220 is the industrial version of the BD-220 six used in the trucks from the early '50's. Yes, the C-221 is derived from the same BASIC design.
That said, the BD [Black Diamond] engines came in a straight-valve configuration [early engines], and a tilt-valve [later engines]. The tilt valve has a wider valve cover. On the truck engines, if you put the pistons from a tilt-valve engine into an engine with a straight-valve head, you end up with around 13:1 compression...and usually major overheating, until you figure out what you did.
"Better" is a relative term. IH went to the tilt-valve engine because the straight-valve engines developed a reputation for hanging exhaust valves open, after which the piston would lop the head off the exhaust valve, with a bit of noise and a distinct loss of power. Tilt-valve engines weren't known for having this problem.
Others may know better about the bellhousing patterns. I'd wager they'd be pretty close...but I've been wrong before.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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