OK, here's what I've dug up so far- - - - -The 292 and the 250 have the same bore size, 3 7/8", same as the 307 V-8. The only problem with using the 307 pistons in the 292 is the fact they would stick out the top of the block 1/4" because of the 292's longer stroke!
What we need is a connecting rod 1/4" shorter, or a piston with the wrist pin 1/4" closer to the top. I think I've found a rod that will work, with a little tweaking. A Mazda con rod, Federal Mogul part # R25BL, is very close to 292 dimensions. It would require grinding the 292 crank to Mazda specs, and running the Mazda rod and bearing. The wrist pin end can be made to fit with a bushing for an International farm tractor, and the added advantage of a full-floating wrist pin is gained. I'm going to have to acquire a set of Mazda 4-cylinder rods, from a 1797 or 1970 CC engine and see if they can be adapted.
I'm going to continue to look for 3 7/8" bore pistons with the right compression height. Pistons, rods, etc. dont know what engine they're in, so I do a lot of this type of parts swapping.
Jerry
