Exhaust help
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Exhaust help

  1. #1
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    Default Exhaust help

    I'm building a 496 and want to run a heavy cam but I'm told that with that there are problems with revision . So what kind of headers will work best on a 700 hp through transom exhaust ? I was told water jacketed ? I have stock indmar headers now and it's also a closed engine compartment also so over transom isn't an option. And I'm hoping to find someone with a used set as I'm on a limited budget and know these things get pricy quick

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    Senior Member jetboatperformance's Avatar
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    Define heavy cam ? specs will be important , your cam choice may or may not be an issue respective to "reversion" , your choices for that HP are jacketed thru hull headers or modern center rize manifolds with special risers (again depending on cam choice) and considering the covered engine aspect of your build Tom

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    Default Cam

    Hey Tom, how are you? Hope everything has been good. When he says heavy cam it will no doubt have reversion issues. Custom Straub deal I don't want to post spec's out of courtesy for Chris. Crazy jet, Tom is a great guy to do Buisness with and very knowledgable . He can help with what you are trying to do. Thanks Scott

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Scott King View Post
    Hey Tom, how are you? Hope everything has been good. When he says heavy cam it will no doubt have reversion issues. Custom Straub deal I don't want to post spec's out of courtesy for Chris. Crazy jet, Tom is a great guy to do Buisness with and very knowledgable . He can help with what you are trying to do. Thanks Scott
    Hi Scott Good to hear from you as well , heres some info from Lighnings site that may be helpfull and explain a bit ... Tom
    Reversion
    Our guide lines are based on a 454 C.I. engine with a standard Mercury header and 8" long collector. The camshaft should be no larger than 240 deg. duration @ .050 lift. Lobe separation angle 112 degrees. Valve lift is not that much of a factor. These figures are just guide lines. Cubic inch displacement, valve size, connecting rod length, valve timing, etc. all have an effect on reversion.

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    This is what I have now and was told by lightning exhaust there are adapters i can add to these but wouldn't they still be to restrictive?

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    Last edited by Crazyjet1; 10-22-2012 at 08:26 PM.
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  8. #6
    Boss of the McIntyre Mob danhercules's Avatar
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    Lightning can make extra long collectors.


    Very first TPR 21' Deck. 528 BBF 736hp on pump gas built by High Flow Dynamics

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  9. #7
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    Quote Originally Posted by danhercules View Post
    Lightning can make extra long collectors.
    Last set of lightnings I had built, jay made the collectors 6 inches longers and did reduced water, damn near dry, cam had over 250 duration @ .050.
    Sent from my electric web watchin tv thing.

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    Senior Member jetboatperformance's Avatar
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    This is the style system we spoke of this morning , Josh and I recently used it on this 540 cu 21 Daytona , very clean, simple to install and plumb would support the level of HP your talking about Tom




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