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Head question

This is a discussion on Head question within the External Engine forums, part of the LSx Technical Help Section category; I have a line on a set of patriot heads assembled never installed for 800 bucks over on ls1tech. Here ...

  1. #1
    Member 1998 T/A's Avatar
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    Head question

    I have a line on a set of patriot heads assembled never installed for 800 bucks over on ls1tech. Here is what he posted

    "I have a pair of Patriot Performance CnC ported perimeter bolt heads. 2.02 / 1.57 valves, and .650" lift patriot spring kit, 67cc chambers. Everything is NEW. Heads have never been run. Nice CnC work, and the exhaust has been hand finished. $800 plus shipping for the pair FIRM. Seriously no tire kickers. If you don't have the cash, don't bother me. This isn't a discussion thread, so stop sending me pm's just wanting to talk about these heads."

    I'll be running a TSP 233/239 cam and a fast 92/92

    I'm also ignorant to the "perimeter bolt" not 100% sure what means

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    Member 1998 T/A's Avatar
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    Need to add its going on an 00ws6

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 heads had the valve covers bolt around the outside of the cover while all other heads use a center bolt.

    Quick answer is you can reuse you 98 valve covers with this head. If you go to a 243 style head it will be center mounted.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    Perimeter valve cover mounting style







    Center mounting style


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    Gotcha thanks...also am I gaining anything with a higher compression ratio? And what chamber size is considered too big or too small for a stock bottom end.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Head question

    For NA (natural aspirated) motors higher compression = more hp. It also can make it necessary to run higher octane fuel. IIRC on 93 oct you want no more than 11.5 to 11.7.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

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