TSPM

Thats about right BUT........as stated textbook maint to get there and the headers can be an issue along the way. Get them checked periodically.

Panther

I put 550 hours on the motors that were in my old boat. They were 502's, 550 hp, merlin heads and solid flat tappet camshafts with stock GM rotating assemblies..... changed valves, springs, guides, milled heads etc. etc. at 250 hours... 90% of its life was spent between 3-4k rpms with WOT bursts every once in a while but for no more than a minute at a time.

525's have better parts than what I had, if treated properly I don't see why they would last as long if not longer with reg. maint.

PS, I didn't have leaky CMI's on those motors.... Stainless Marine all the way!

lowblue320

thanks, if you guy know of any for sale im a cash buyer let me know.

TSPM

Somone on here posted a thread with a pair for sale not too long ago.

TSPM

Found it...http://www.offshoreonly.com/forums/s...d.php?t=169201

lowblue320

yea not for sale any longer.........

lowblue320

patience my boy.... patience.

25 hors la loi

Quote:

Originally Posted by lowblue320

I would like to know how many hours before a rebuild on a 525.....200 hours give or take and about 40%-50% of it is below 2k rpm.....pleaser use.....?

Ok mine... 200 Hrs , i do compression test ....and 155 to 160 psi ....and still running strongth !!!! i will redone test at the end of the next coming season (+/- 100 hrs )

slboatdrinks

Just had one fail at 80 hours. Sunk exhaust valve in #8 cylinder.

Regular maintenance performed at 20 hour intervals using Merc 25w40. Spent 95% of it's short life between 3200 and 4500 rpm.

mikebrls

thats suck's.
i guess that motor was built on a monday or a friday .