is anyone running 600 sci's with xr's on 42 foot boat.. from factory in 05.. will they hold up to hp. realy just 75 more hp than 525's.
Like to install stage 2 kit but worried
any feedback would be appreciated

Thks Joe

Hey Joe,

I'm running 600SCI's in a 05,38 ft Donzi ZR. I have XR's with extension boxes. I have to be really gentle with the drives and have had a few issues but generally pretty reliable. Props are Hering 5 blade 32 pitch which blow out alot on me coming on plane. I have used the Merc maximus 5 blades, they plane out faster but put more stress on the drive so I like the herings better, plus they are a little faster.

Mark

Have you thrown any herring blades yet ? and what is your X dimension , just curious ,thanks

Haven't thrown any herring blades yet, did throw a blade on the merc maximus though. Also, blew a drive last saturday. 2 teeth broke off the pinion gear which then cracked the case on my upper.

Would have to measure my x dimension, fairly high though.