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Hawk 525 vs merc 525?

Old 01-08-2012, 08:32 AM
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Default Hawk 525 vs merc 525?

Does anyone know the actual differences between the 2? I have found quite a bit of info on the merc motors but not much on the hawks. A few have said the hawk is just a 420 with a blower. Any truth to this?
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Old 01-08-2012, 09:05 AM
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Hawk ran higher compression and less timing than the merc. That gave it a different torque curve.
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Old 01-08-2012, 04:04 PM
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Not to hijack, but to expand...

Was quality comparable?

Did Hawk also build a 575?
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Old 01-08-2012, 05:32 PM
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Originally Posted by lil red View Post
Does anyone know the actual differences between the 2? I have found quite a bit of info on the merc motors but not much on the hawks. A few have said the hawk is just a 420 with a blower. Any truth to this?
yes, the two we rebuilt in the 90's were basically 420 's with bm 174's .
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Old 01-08-2012, 05:34 PM
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174s or 177s? I've read both guess I'll have to look for some numbers on the blowers
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Old 01-08-2012, 05:54 PM
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My Hawk 525 has a 250 on it. Not sure if previous owner upgraded it.
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Old 01-08-2012, 06:02 PM
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Must have been upgraded seems its a pretty common upgrade
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Old 01-09-2012, 01:51 AM
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Hawk 525sc's were Merc 420's with B&M 174 blowers.

Merc 525SC's used a lot of the same major parts as the 420's. Same block, heads, and cam. Merc ran lower compression 7.5:1 pistons, more boost and more timing. They used Weiand 177 blowers.
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Old 01-09-2012, 06:31 AM
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I have a set of Hawk 575s??? They have B&M 250s on top. I believe the previous owner upgraded the blowers.

So, were there two models, 525 and 575?
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Old 01-09-2012, 12:09 PM
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Merc 525 ran a Weiand 177. Hawk 525 ran a 174 B&M. Ocean Performance was the entire start of that with Bud and Craig.
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