Thanks for the info guys, I asked him for mph #'s from 4k to 6k in 500rpm increments, it does have gps speedo but he wasn't watching it, it is a trs boat so I don't want to put to much stress on them, boats been sitting for 5 years, I fixed the engine problems a few weeks ago he's just glad to be back on the water.

Thanks man, I'll check with Mike..........are they in KC ?

With TRS and 575-600 HP personally I would stick with 3 blades if he beats it at all, leave that couple % of slip trust me... I bet a worked 25 mirage will perform great and help keep drives alive, that power level is about all them tiny lower gears will take and stay together, 4 blades or more then 600 HP create time bombs.

my 2 cents
i am spinning 4 blade 26 pitch hydromotive props
considering still getting use to these motors
547 about 700hp???
boat ran 82 at 5600, 4 people full tank of gas, and flat water

TIME BOMB?????
hmmm really i hope not,,,, well i know my boat has had same set up since early 90's
i know prior owner had one drive rebuilt, never said anything more.
but i have owned boat since 2012 ,,same props,,600 hp now 700 hp
i just try to run easy on drives and boat..keep it in the water...

plus 2,000lbs

I guess it's because I use mine like intended, I don't baby it, why have it? I bought a SSM boat after trying to keep TRS alive for years...