JRider

How much did HP fall off after 5700? @ 6k?

SB

Typical magazine story and typical dumb dyno test - they did not go past peak.

rob vanharten

That's good info, thanks!!!

JRider

http://www.chevrolet.com/performance...z-572-620.html

Doesnt look like it really falls off at all if you can believe chevys site...I would still prop for 6k. It makes an NA boat more fun to drive

TylerBurich

I was very interested in buying this boat for a very long time. Seems like a lot of bang for the buck. Get the details worked out and you are gonna have one hell of a fast boat. Did the previous owner set the heads up for marine use?

rob vanharten

Great information so far guy's, I really appreciate it. So at this point I should be checking my total timing, should it be 36 like Chevy recommends? And should I drop in prop pitch to get more rpm's? Is the X to low at even with the bottom, should I be going up?

onesickpantera

I would definitely check the timing. Most people run the zz572 at 5400-5800 rpm.

rob vanharten

36 degrees? Or is that to much for marine use?

onesickpantera

36 might be a bit much but I'll let the experts chime in. I would think 34 would be safe.

SB

The dyno test in the rag mag was 33° if that matters. Which it usually doesn't.LOL.