Some light research leads me to believe that 14 5/8" is the max diameter prop that will fit. Lake Lanier is a little sticky/loggy, and if I go max diameter on the prop, I won't be able to spit out as much if the prop gets into floating debris. I'm going to stick with the 21 pitch we have unless we over rev with that like we do with the 19.
I'm going to do some temp tests on the outdrive housing when we get some running time on the boat. I have one of those nifty I/R temp guns to do so. If I see alarming upper gearcase temps, I'll rig a transom shower for it.
On our test run, we had a guy in a Cobalt 360 cruiser pull up and ask us if we had a 454 in it. He was running twin 8.1's. That is one helluva nice boat - he bought his used for a buck and a half, and ships it between Lake Lanier and Mexico Beach, FL, twice a year. That's about $6k one way shipping cost, plus shrink wrap and wrap stripping fees, plus removal and reinstall of the radar arch each time. Mu$t be nice...
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