www.iFourWinns.com

BTW, is that a typo? Mineral oil?

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Current Boat: 2000 Four Winns 298 Vista
Previous Boat: 2000 Carver 406MY

I think some people say mineral oil when they mean dino (conventional non synthetic) oil.
The Chevy engines in most I/Os and inboards are over head valve designs that are not really meant for constant high rpm use in stock form. Yes they can be modified to live at high rpms (similar engines have been used in NASCAR for years, living at close to 8000 rpm) but it takes racing components to achieve that.
Two cycle outboards can run at close to max rpms because there is essentially no valvetrain.
Four cycle outboards can do the same thing because their twin over head cam designs are built for it.
Chevy overhead valve engines were designed to be relatively inexpensive to produce (compare the cost of re-powering one of these vs an outboard, it's much less), produce good torque at moderate revs, but constant high rpm use was not part of their design.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

^ what he said. The V6/V8 in your boat is using 80's car technology engines. Go buy a 1985 Chevy pickup truck with a 5.0 V8 and drive it around town EVERYWHERE at 4000rpms and see how long it lasts. That's the same engine you have in your boat.

Why boats don't have DOHC engines blows my mind away. A modern 150hp DOHC inline 4 would last FOREVERRRRR in a boat. A ford modular 4.6 DOHC V8 would last 20 years @ 4000 rpms with 300hp and get much better GPH.

If my engine ever blows up (3.0 VP), you bet your behind that I'll make the adapter plate and bolt in a Honda F20C engine out of a S2000. Half the price of the crappy chevy 3.0 and nearly double the HP and will run for a lifetime @ 6000rpms.

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

A 2007 will not let you run above redline. Once it hits the limiter you are done. Your boat will run just fine at WOT, which is 4400 to 4600 rpms on your engine. I am not saying run it that way for hours on end but running it like that is not killing it. Facts are that most boat engines blow up at mid range and its usually due to overheating, running lean, running out of oil or something like that...not being "worn out" from running at WOT.

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Brian Borchik
The Winds of Cold Springs Harbor Marina
Baldwinsville, NY