5.9L Magnum recipe...

LS3s came in newer Camaros and Corvettes, plus a few other vehicles in various tune/trim. They are rated at 426 HP or 430 HP at the crank, depending on which numbers you look at. Rear-wheel dynos have them putting anywhere between 350 and 370 HP and about the same in ft-lbs. to the ground in newer Camaros. Of course, that's on 89-octane gas; they lose a bit on 87-octane regular.

The machine shop said the bores were two or three thousandths out of round and "a lot of people get away with basic rebuilds using just a clean-up hone, but I sure as hell wouldn't do it for anything over the cheapest stock rebuild." I'm leaning towards just .020" over, since it seems like piston selection is good at that size.

Sorry if I'm not being very clear. all of the other engines I've rebuilt have just been stock-type rebuilds with/for friends. This is really the first time I've had to pick out basically everything.