Rebuilding own engine

I've had the boat 6 months, I usually cruise around 3800-4000 rpm. Probably put 30 hours on them, lots just trawling around at 10kts too.

When it went, it had seen a number of 60-90 minute runs in the previous 48 hours - first weekend away.

WOT is 46-4800 but I've struggled to verify this as both tachos have started to wander a bit.
 
I'd try to keep them below 3800 rpms most I run is 3800 at 33mph, nicest at 3500 with is about 29 to 30mph. numbers maybe off a little. If you push your car that hard, it wouldn't last that long either.
 
Yeah, there is no doubt she's under powered. I can't hold plane without 3800 and even then, really needed 4k to boogie.

Hopefully with brand new + recently recon'd we can in future cruise 17kts with 3600

I wanted to repower this time around, but got over ruled by "co-captain", aka my father. He went 1x new, factory mercruiser v6, I would have gone 2x reman 5.0l v8s. These things happen tho
 
have you compares the price of rebuilding versus a factory reman? i replaced mine from jasper engines, the long block with 18ms warranty came to 2200.00 and if you have a shop you'll get it for 1800.00
 
It's not worth the risk to rebuild this yourself without prior experience. Also the warranty will be with the reman company not you if something goes wrong. I think I would purchase a reman short block and have your heads rebuilt and install them on the block. This way you can have the satisfaction doing some work on the engine and still have the warranty in place on the block.
 
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