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496/525 top end

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Old 03-28-2011, 11:28 PM
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Default 496/525 top end
Approximate how many hours should a 496 and 525 expect a top end to be serviced?

thanx
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Old 03-28-2011, 11:44 PM
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If you are talking about a Mercruiser 496Mag or HO then the valve train stock should be good for 700-1000 hours with good service and use. On the HP525efi engines Mercury Racing recommends checking the valve train at about 200-250 hours I believe.

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Ray @ Raylar
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Old 03-30-2011, 04:40 PM
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Wow that's quite a big difference in time.
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