I have been poking around the internet and haven't really found a lot of information. I gather that the peerless 600 is the transmission I should be looking for and I have my heart set on a briggs, and I did see and article referring to the 28 CI as the small block chevy of mowers and it has a lot of aftermarket support. I also read that the ones that say I/C are more stout. So I have a couple questions, whats the difference in all the briggs engines? I see all kinds of HP ratings on mowers on craigslist, which one should I be looking for? So basically what mowers had a good briggs engine and the peerless 600? Ohh and I don't plan to run it in any classes, its just for fun. I hope I posted in the right area and any help would be appreciated, Thank you.