its according to the year of the engine but from 79 toabout 92 all GM V6 and V8s make about 115 to 150 hp unless you got a H.O. 350. I know one guy with an oldsmobile V6 in his 81 fleetwood and its just as fast as one with a 4100 in it. its also lighter and uses less gas than a V8. If you want power get a HO 350 or a big block. Also some of the newer chevy engines make more power.