Hey yall, had some spare time this weekend so i made a video explaining all the differences between briggs model 25 and 28, the 25 is a 11 horse 252707, and the 28 in the vid is a 12.5 horse 286707, i explained all the differences that i know of and how to make a stroker out of it, which i plan to do eventually, hope that helps i know there's been alot of talk about the 25 to 28 stroker, but here's a video hope it helps some...
http://www.youtube.com/watch?v=H1kiFqCDCh0- Frank