[crazy longhorn]

If you plan an Olds swap,think 455....bigger is better! The Olds engines have a taller deck, & also longer rods than a chebbie. The 350 Olds has 6" rods vs the 5.7s in the 350 chev. In the BB crowd, the 455 is a 4 1/8" bore x a 4 1/4" stroke.....6.735 c to c on the rod lenght. The old 425s were a 4.125 bore X 3.975 stroke, & had a rod lenght of 6.998......compair that to a BB Chev! Olds enginges are a high nickel content on the castings, & can run 150,000 & generally clean up with a .030 overbore (much like the Caddy engines on nickel content). They arent cheap to build tho......I have 3 more BB olds engines packed in grease , but am running sb Chevs. Andy (longhornmail) told you right, the cams were very mild in the Olds engines, as well as the valve springs being very light. if you plan to wind them up, valve train & oiling system problems need to to be straightened up. a pretty stock shortblock 455, with a little head work& a mild cam, torker intake/800dp will make a real "hairy" ride in a 1/2 ton truck crazyL