[rotorwrench]

The Tex Smith flathead book had an article about a 37 engine that was modified for the Great American Race (GAR). They used a late 255 Merc crank with a lot of mods to work in a 1935 coupe. They wanted 3 3/16 standard 255 pistons and 4-inch stroke all in a little 221. They bored through the cylinder walls to get larger sleeves to fit. I know they turned the crank and it seems like that had to clearance somewhere else to get the 4-inch assembly to work but I'm not sure where. These things become apparent after you get a rotating assembly in there and start turning it though. It wouldn't take long to find any other clearance problems at that point.