Most of the V-20's I see in the ocean have 150s on them probably because you can never run them full out and the 150 is cheaper to run and lighter. I know a guy with a new Merc 135 opti max on an 84 V20 that will barely out run my old 83 V20 with a 150 Black Max but I just got a free power head for it so I will keep it until it blows then I will probably go for a newer 150 to 200. The newer motors are faster but some of them are very heavy especially the 4 strokes. Frank