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mercruiser 525 headers

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Old 01-08-2012, 10:26 AM
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Default mercruiser 525 headers

i should know this but i dont,will the factory cmi 525 headers bolt up to standard bbc heads??
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Old 01-08-2012, 10:32 AM
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Yep
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Old 01-08-2012, 10:32 AM
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Originally Posted by proboat-wes View Post
i should know this but i dont,will the factory cmi 525 headers bolt up to standard bbc heads??
no. but they can be modified .need to drill 4 holes on each header .the 525 s have a 3/8 ths offset bolt on each cyl . nice that merc did that so you could only use their headers

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Old 01-08-2012, 10:43 AM
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no. but they can be modified .need to drill 4 holes on each header .the 525 s have a 3/8 ths offset bolt on each cyl . nice that merc did that so you could on use their headers
Oops . . . . Are the 500 and 525 different headers?
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Old 01-08-2012, 10:52 AM
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Oops . . . . Are the 500 and 525 different headers?
yes they are .525 600 and 700 .i think once the patent ran out cmi will make them w both patterns .i think they do now
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Old 01-08-2012, 11:00 AM
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Bolt pattern is different on the 525 heads but they can probably be redrilled as mentioned. There is not much room for the end hole though.
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Old 01-08-2012, 11:02 AM
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thanks for the help. when the headers show up this week ill fire the drill up and reposition the holes according to my exhaust gaskets,wes
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Old 01-08-2012, 11:12 AM
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easy to do just copy the gasket . but the stainless flange is tough to drill
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Old 01-08-2012, 11:23 AM
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so does hold true for set of 99 etop 500 efi headers too, just bought a set of AfR heads, didn't bother to check to see if the header bolt up...
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Old 01-08-2012, 11:48 AM
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no only . only 525s 600 700
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