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HP 500 with KE exhaust reversion?

Old 02-27-2021, 06:35 AM
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Default HP 500 with KE exhaust reversion?

Hi guys. I'm putting a HP 500 in my 1998 Cobalt 252. I would like to keep the Captains Choice if possible. Seeing everyone makes a a specific exhaust riser for the HP 500, because it sucked water so bad, I'm wondering if the Keith Eickarts would still revert?

stock cam #169611 .576/.598 222/230 110 LSA

The engine swap will be happening soon, so if I cannot use the CC, I will be removing the Y pipe and blocking off the exhaust opening on the Bravo.

Thanks for any input about this
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Old 02-27-2021, 07:31 AM
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Are you refeering to the KE aluminum headers? If so I can not imagine an issue with reversion with the hp 500 even with 741 cam. If you have reversion with that set up then I'm Concerned about sucking water up from the lake with my stellings dry to the tip above water platform.
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Old 02-27-2021, 07:45 AM
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the original hp500 carb'd cams were know to revert,even w/ the tall risers.you either change cam to the 731(a little bump in power) or as you idle in,keep the rpms up and then in neutral,rev it up and shut off at the same time.it blows the little bit of water out.
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Old 02-27-2021, 08:00 AM
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I had the a HP500 carb w/ KE Exhaust in a 28 Velocity, ran strong for ~150 hours, no reversion issues at all. KE's have full 32" runners, so the water has a long way to run backwards. In fact I have (2) new sets of KEs that I'm going put in the Skater 1 of these days...
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Old 02-27-2021, 12:47 PM
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I wouldn't run the switchable exhaust with Carbed HP500's unless you swap cams.
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Old 02-27-2021, 04:57 PM
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OK, so no CC.

I will be eliminating the Y pipe then. Thank you
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Old 02-27-2021, 05:00 PM
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Originally Posted by getrdunn View Post
Are you refeering to the KE aluminum headers? If so I can not imagine an issue with reversion with the hp 500 even with 741 cam. If you have reversion with that set up then I'm Concerned about sucking water up from the lake with my stellings dry to the tip above water platform.
Yes, I was referring to the Thunder n lightning aluminum exhaust
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Old 02-27-2021, 05:01 PM
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Originally Posted by sutphen 30 View Post
the original hp500 carb'd cams were know to revert,even w/ the tall risers.you either change cam to the 731(a little bump in power) or as you idle in,keep the rpms up and then in neutral,rev it up and shut off at the same time.it blows the little bit of water out.
So the taller riser "fix" still didn't resolve the issue? Damn....
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Old 02-27-2021, 05:03 PM
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Originally Posted by Dean Ferry View Post
I had the a HP500 carb w/ KE Exhaust in a 28 Velocity, ran strong for ~150 hours, no reversion issues at all. KE's have full 32" runners, so the water has a long way to run backwards. In fact I have (2) new sets of KEs that I'm going put in the Skater 1 of these days...
Did you have the short 6" extension that comes off the manifold? Or was it longer/closer to the transom?
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Old 02-28-2021, 06:31 AM
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Originally Posted by xlint89 View Post
Did you have the short 6" extension that comes off the manifold? Or was it longer/closer to the transom?
X,
The shorter standard 6" Bravo wet tailpipes.
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