[m&mmariah]

Ok, I installed a 4 blade aluminum, 14 x 20 prop today for our upcoming trip to 4,000 ft. elevation lake Powell. Running a 4.3 vortec, alpha one, 1.81 to 1 ratio, 4bbl carb on a Shabah 180. Guessing this should be just about right for cruising the lake with a full tank of gas, small dog, and wife. No towing, just cruising around to check out the scenery. Might have to adjust the idle speed and the idle mixture screws, but am guessing everything should be ok at 4000 ft. Sound good?

[mikeyt]

You might have been better with a 3 blade 19" but the 4 blade - 20" will work okay for cruising around but it will suffer somewhat in performance. If you read post #3 in this thread here in the Prop forums you should find the answers you are looking for.