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Hawk 525SC Upgrade

Old 08-21-2019, 12:59 AM
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Originally Posted by Griff
If you're doing new heads and full roller cams, you should be able to make 600hp+ with the 174's.
I would build the engines internally to be able to handle 700+hp.
Then I would use your 174's and see what they do. I wouldn't do chillers as I think you'd be better off go to just go with bigger blowers if you want more power.
You will probably need more carb. I would send yours out and have them made to 950-1000cfms.

If the 174's don't make enough hp for you, then upgrade to big blowers later.
Thank you, I think I'm on the same page. I don't want to do much more in HP because of the drives, I'm running 88GPS and they make less than 500 HP now. I totally agree with over building them though. Just need to determine a builder, my last one passed a couple years ago.
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Old 08-21-2019, 07:21 AM
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This is how my 454 build dyno'd
668 ft/lbs at 3600
616 hp at 5500
incredibly flat torque curve 640ft/lbs at 2700
ran on 100 octane
454 -60 over, 188 heads, Howards roller cam, 8.5 static comp
177 blower with 3" pulley on top and 7" on the bottom
Teague chillers too
Single Holley Sniper
Dyno headers with magnaflow mufflers
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Old 08-21-2019, 08:36 PM
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Originally Posted by RBeyer
I'm running 88GPS and they make less than 500 HP now.
Less than 500HP, how do you figure that with 5lbs of boost. That boat has always ran 88 mph with the Hawk 540's.
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Old 08-22-2019, 12:02 AM
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Originally Posted by Rookie
Less than 500HP, how do you figure that with 5lbs of boost. That boat has always ran 88 mph with the Hawk 540's.
Dyno sheets from the builder that came with boat say 465 HP. I didn't build them but they do need to be made better. I bought it this way.
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Old 08-22-2019, 09:27 AM
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Originally Posted by Rookie
Less than 500HP, how do you figure that with 5lbs of boost. That boat has always ran 88 mph with the Hawk 540's.
I can't speak for what may have been in their previously but the boat currently has Hawk 525SC's basically a 420 with a 174 blower. It's a mild build considering the way the boat runs. It does need to be beefed up a bit.
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Old 08-22-2019, 03:11 PM
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I forget what were in the boat. I thought the they were Hawk 540's, but could as easily be 525's. I believe they came out of the Hawk Cigarette. Are the Dart Iron Eagle heads still on the engines?
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Old 08-22-2019, 06:22 PM
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Originally Posted by Rookie
I forget what were in the boat. I thought the they were Hawk 540's, but could as easily be 525's. I believe they came out of the Hawk Cigarette. Are the Dart Iron Eagle heads still on the engines?
It has Merlin heads
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Old 08-22-2019, 07:17 PM
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Originally Posted by RBeyer
It has Merlin heads
I'm sorry, that's right they were Merlin.
Now back to your original question. I believe you could achieve your original goals with roller cam, larger blower (no chiller) and same heads.
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