i started a topic on here last summer about the 25 11 horse, i have 2 of them, it is possible to put a 28 crank in the 25 block and make a stroker out of it, but you have to do grind the block here in there for it all to fit, and grind the head, because when i was checkin this out, when the piston was at TDC it stuck out of the cylinder at least 3/16 of a inch! would either have to do some work on the head or get a shorter rod. now i didn't build it i just stuck a crank in the block and dropped the rod and piston down on it, but the rod hit the camshaft and the opposite side of the block. just thought i'd add that. lol