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Old 08-19-2015, 08:15 PM
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Default Gill exhaust

I have a couple of Bulldogs that I am going to install new heads and cams and was wondering how much horse power Gill exhaust can support. I am looking to go to 675 to 700 hp. Thanks in advance for any response and help.
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Old 08-20-2015, 10:14 AM
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Interested in this as well since I have the same manifolds I believe
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Old 08-20-2015, 06:07 PM
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Anybody have any thoughts on how much power gill exhaust can handle?
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Old 08-20-2015, 07:08 PM
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What head and cam package are you putting together to make that kind of power?
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Old 08-20-2015, 07:10 PM
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What was the highest output engine that used the Gills? The orginal 525SC or 600SC?
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Old 08-20-2015, 08:53 PM
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Originally Posted by Powerquest230
What head and cam package are you putting together to make that kind of power?
Pro 1 heads, full roller cam by someone smarter than me, 1050 carb and raise the compression to 10.5 to 1.
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Old 08-21-2015, 01:44 AM
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They start getting restrictive around 600hp.
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Old 08-21-2015, 03:18 PM
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check this out.

http://www.offshoreonly.com/forums/g...rformance.html
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Old 08-21-2015, 07:40 PM
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If you're going to buy new exhaust manifolds, then Stainless Marine is supposed to have the better performance over the GIL system due to a better design for exhaust scavenging. I would take a closer look at the Stainless Marine system.
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Old 08-22-2015, 08:03 AM
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So will they handle 700 hp or should I just figure on new exhaust? There will be no more upgrades after these mods.
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