Yeah, the 5.75" Chrysler rods found in 215, 245 and 265 Valiants have 2" rod bearings, and Chev size 0.9270" wrist pins. This is 1/8 th of an inch, .125" smaller in the rod bearing, 0.103 thou shorter, and one heck of a lot stronger than any 200 or 250 Ford rod.
The result is a worse rod ratio if you don't chose to offest grind the crank, it drops to 1.47:1 with a rod journal reduction, stock 3.91" stroke.
or 1.425 if stroked to 263 cid at 4.035",
Rod ratio is slightly better than stock at 1.52:1 if the stroke is dropped to 3.785". A 40 thou over 250 then becomes a 247 cid donk.
Reducing the diameter from the stock 2.126" journal won't hurt crank strength at all if the fillet radius is ground to 20 thou or so and polished.
Most people seam to be using Ross pistons for 3.9Rover, Chev 262 V8 or Chev 229 V6 pistons. Range of compression heights is from 1.62 to 1.73". Stock aftermarket 245 Valiant pistons used to have have 3.76" bore size, or 80 thou oversize, and a 1.77" deck, so they may fit. I doubt the 245 ones are a awesomely strong as the rods, though!
