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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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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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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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Originally Posted by Whipple Charged
(Post 2706715)
Edelbrock heads made for Mercury Racing. Standard bolt pattern for bolting on to block, and manifold, different exhaust flange bolt pattern.
Ditto!:cool-smiley-011: |
How far off are the holes can a set a lightings be altered to fit
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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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Any one have a pic of the gaskets that show the difference in the holes?
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just buy a gasket and use it as a template
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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 |
Originally Posted by skaterboy
(Post 2711486)
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 / Nic |
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