Re: Anyone know about 120hp OMC GM Motor?
are you sure it is an omc and not a merc. If it is in a stuery it may well be a mercruiser. Also you may want to post this above under mercruiser, volvo, omc I/o and Inboard engine problems. Someone in that area will definately be able to tell you where to get the correct manual if you have the serial # off the engine.