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2007 Mercruiser 525 efi

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Old 10-04-2008 | 08:00 PM
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dennis r
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Default 2007 Mercruiser 525 efi
What heads are on these motors?And are the bolt patterns the same as a big block chevy?
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Old 10-04-2008 | 08:40 PM
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Hydrolift
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I think the heads are made for Mercury, and they have a different bolt pattern than the std. BB. Do a search here on OSO.
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Old 10-05-2008 | 07:22 PM
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Edelbrock heads made for Mercury Racing. Standard bolt pattern for bolting on to block, and manifold, different exhaust flange bolt pattern.
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Old 10-06-2008 | 06:22 AM
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Originally Posted by Whipple Charged
Edelbrock heads made for Mercury Racing. Standard bolt pattern for bolting on to block, and manifold, different exhaust flange bolt pattern.

Ditto!
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Old 10-06-2008 | 07:38 AM
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dennis r
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How far off are the holes can a set a lightings be altered to fit
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Old 10-08-2008 | 12:44 PM
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You need to weld up 4 of the bolt holes and redrill them. You will also most likely need to add about a 1/4" of material to the ends of the header flanges to make room for the outside bolts.
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Old 10-08-2008 | 04:13 PM
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dennis r
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Any one have a pic of the gaskets that show the difference in the holes?
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Old 10-08-2008 | 04:39 PM
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just buy a gasket and use it as a template
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Old 10-09-2008 | 08:10 PM
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I have Qty 4 - 525EFI Heads for two engines For Sale, with 70 hours of running time. Heads are complete with valves & springs, no rockers.

Ray
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Old 01-14-2009 | 11:20 PM
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NicT
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Originally Posted by skaterboy
I have Qty 4 - 525EFI Heads for two engines For Sale, with 70 hours of running time. Heads are complete with valves & springs, no rockers.
Ray
How much?

/ Nic
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