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317 heads and gasket help related to turbo info

This is a discussion on 317 heads and gasket help related to turbo info within the Internal Engine forums, part of the LSx Technical Help Section category; ive been wondering a few things and i know this has turbo on it but im more wondering about the ...

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    Senior Member JoshuaGrooms83's Avatar
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    317 heads and gasket help related to turbo info

    ive been wondering a few things and i know this has turbo on it but im more wondering about the a few internal things with it.
    Ok ive got stock unmolested 317 heads.
    Im going to running a stock 5.7L block and considering some mild cam in the 224-226 114LSA range depending on a few things but im sticking around that cam range
    Im building up a rear mount turbo with a ON3 T76 turbo, 31"x11 intercooler, 60lbs injectors, racetonix fuel pump and hotwire, aeromotive BR-FPR set at 60psi and return line, basic water/methinjection set to full at 4psi, 10-14psi max boost, 2bar map, 3200 stall, 2.73 gears, and a tune of course.
    Im aimming at 550-600hp range

    Im wondering on the gaskets specifcally with 317 heads.
    Ive been messing with the CR calculator and having been wondering which head gasket would be best to run with.
    With the stock GM MLS gasket at .056 gasket CR is about 9.7:1
    With LS9 gaskets at .051 gasket, CR is about 9.8:1
    WIth cometics at 0.40 x 4.010 gasket bore, CR is abuot 9.9:1

    which would be best suited for this build? i know the 317 flow simular to 243s but with a 72cc camber that lowers the combustion chambers CR. but if i use the .040 gaskets, it almost puts the CR in stock location. minus a few tenths. so what should i get?

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    Moderator 35th-ANV-SS's Avatar
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    Not to side step, but are you certain that a single Racetronix fuel pump can support that much power?

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    Senior Member JoshuaGrooms83's Avatar
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    according to racetronix and most of everybody else its about done at 600ish hp so that about what im shooting for starters. ill look into dual pumps later, but for now i have the racetronix single 255 for now. ill proply make sure the boost is dialed down enough to keep it safely at 550 until then lol
    Last edited by JoshuaGrooms83; 01-30-2013 at 03:11 PM.

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    Moderator 35th-ANV-SS's Avatar
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    I see. I just wondered because you stated 550HP-600HP. At 10-14PSI I think you'll be making more than that.

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    Senior Member JoshuaGrooms83's Avatar
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    im just generalizing the boost, just makign sure i leave room up top just in case so i dont get under tuned and have issues later.

    With my current 301rwhp (stall), with everything relitive and in a perfect world, using the calculator, 10psi put me at 505hp (of couse that with out timing and meth included in the mix) so im just shooting a ball park figure.

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    Moderator 35th-ANV-SS's Avatar
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    I made 550rwhp at 10psi with a stock cam and stock heads. Of course, you'll have lower compression than me. Just making sure you don't run your pump to its ragged edge.
    It's on jackstands.

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    Senior Member JoshuaGrooms83's Avatar
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    oh ok, lol thanks. its not gonna hapeen anytime soon. im still trying to decide on a cam. the car will be on stock cam and heads until then. just researchin a bit

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    Moderator 35th-ANV-SS's Avatar
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    You also have a turbo which will make more power than my supercharger

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    Senior Member JoshuaGrooms83's Avatar
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    lol yeah theres that too lol

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    Senior Member JoshuaGrooms83's Avatar
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    well i talk to martin at tick performance and he recommened a nice sized cam for my rear mount setup. 226/235 .6##/.6## 114. said it wuold run very simular to a 228R but with more exhaust duration to help put more load on the turbine for spool.

    just wanted to know what ya'll think about running 317 head unmolested lol with .040 gaskets with this? gives me a 9.9:1 CR roughly using the calculator. martin said i should have no PTV issues.

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