Re: Difference Evinrude 150 & 175hp?
Those are the 60 degree loopers and are completely interchangeable. The carbs and throttle bodys are different but we never saw that much of a difference. Put 175 heads on the 150. Depending on your hull type you may see a small gain. I gained about 200 on my ski boat (6300 to 6500). Some 150's had 175 heads already. If I remember correctly the last 3 numbers of the 175 heads were 311. They were on the 150 GL and SL models I believe. The 175's had slightly better port timimg. <br /><br />Are you sure you are getting everything out of your existing set up?<br /><br />Good luck!
