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How many hours is considered "high mileage''?

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Old 05-15-2007, 04:26 PM
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you can call www.marineassault.net aka www.moritzmachine.com in tulsa to get a rebuild quote.
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Old 05-15-2007, 04:57 PM
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Originally Posted by JPD Motorsports View Post
you can call www.marineassault.net aka www.moritzmachine.com in tulsa to get a rebuild quote.
He is doing mine. I would allow 10k for rebuilds.
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Old 05-15-2007, 05:13 PM
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Originally Posted by CigDaze View Post
It's tough to say.

The number I hear thrown around as a 'rule of thumb' on most stock motors is a life expectancy of about 1000 hours - well maintained, of course. 700 is getting up there, as is the age.

700 hours on a motor 3 years old verses 700 hours on a motor 14 years old also makes a huge difference. I honestly wouldn't expect them to last much longer before a rebuild is necessary.

But having said that, I know of a guy who owns a commercial boat with a pair of 496's who has turned 2000. However, they're only 2 years old.
What CD says is right on the nose ....


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Old 05-15-2007, 06:54 PM
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my 502's show almost 700 hours and i know the hour meter has been replaced i have put 400 on it and it is almost all at wide open throttle and they are perfect , use no oil and have 60 pounds of oil pressure. but i am a maintence freek
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Old 05-15-2007, 08:19 PM
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use marineassult in Tulsa. He did my 502 and I am extrememly happy with the work done and the price. You should at least plan on a top end rebuild. The springs and valves have got to be tired after 700 hours.
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Old 05-15-2007, 08:23 PM
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Originally Posted by jryan26 View Post
He is doing mine. I would allow 10k for rebuilds.
You got more than 10k in cams!
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Old 05-15-2007, 08:29 PM
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Most people can relate easier to mileage, so somebody figured out that every 200 hours relates to about 15,000 miles on your car. I heard this many years ago from a Mercruiser rep and nobody's ever told me it was way off.
I would think that there are many variables that would affect these numbers.
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Old 05-15-2007, 08:34 PM
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You got more than 10k in cams!
those are some expensive cams
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Old 05-15-2007, 10:13 PM
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I have 40 hours on my truck and the odometer says approx 10,000.
700 hours, depends on how well maintained, I'd not be afraid of them, but would also expect a rebuild soon, as you never know how the previous owner REALLY operated the boat.
Expect a full rebuild by a reputable builder to be $7,500ish per motor.
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Old 05-15-2007, 10:17 PM
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Originally Posted by BillR View Post
I have 40 hours on my truck and the odometer says approx 10,000.
WOW that must be a really fast truck!

40 hours = 10,000 miles is 250 MPH AVERAGE!

I think you can replace the motors with new for less than 7500 each, they are 330 HP 454's.
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