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.....?

Probably around 350 to 400. We have 340 I think on ours. We did the top ends about a 100 hrs ago. They still run strong!

thank does any one else have them so that I can get some opinions.

400-500 with proper maint.

Good time to rebuild the heads with all new parts and new roller lifters... Should be good for another 2-300 more hours with regular maint.!

Watch the headers

thanks guys just wanted to do things right.

Yea that to. They are very leaky!! Where's the pics of the new Motion Lowblue320??? The 525's are a great package for that boat.

Just curious, but why do you have almost half your hours below 2K rpms? Lots of no wake zones perhaps??

From what I am told it is not good for marine big blocks to run at low rpm for a large percentage of time.