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Which chamber size?

This is a discussion on Which chamber size? within the Internal Engine forums, part of the LSx Technical Help Section category; Recap: I have a Comp Cam's 222/224 @.50, 112 LSA, .556, .560 lift. I have upgraded the valvetrain to complment ...

  1. #1
    Junior Member
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    Red
    1987 Trans Am

    Which chamber size?

    Recap:
    I have a Comp Cam's 222/224
    @.50, 112 LSA, .556, .560 lift. I have upgraded the valvetrain to
    complment this cam along with 1.8 rockers (not yet). I will also have a LS6 intake, ported throttle body or aftermarket, underdrive pulley, and long tube headers. Once the project is all together, I will get a custom tune. I do not mind a higher compression, but I also do not want to have to have it sky high either. I might have to "flycut" the pistions due to the 1.8 rockers. I want as
    much power as I can get!

    Patriot Performance offers LS6 bare heads for $745 a pair. That includes guides, seats and CNC chambers. They give you a choice on what chamber size you can have. It varies from, 59, 64, 68, 72. Which one?

    Keep in mind. No nitrous, no boost. This motor is going to be in a street driven car. I want as much horsepower as possible. In case you were wondering.

    Thanks guys

  2. #2
    Senior Member ninobrn99's Avatar
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    Pewter
    all bore 370 Trans Am

    64.45 is the stock cc for the ls6 heads. Id shoot for 62 or 59. You can play with this to check your SCR: http://www.rosspistons.com/calculator.php
    I think the 1.7 rockers are fine. There isnt much need to bump up to the 1.8's. Make sure you get the proper size PR's. what gaskets are you going to use?

  3. #3
    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    to much lift with the rocker arms if you go 1.8.
    you will have to fly cut the pistons
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  4. #4
    Senior Member ninobrn99's Avatar
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    Pewter
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    not to mention springs that will take the added lift.

  5. #5
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    Red
    1987 Trans Am

    The springs are good to .600. I think you guys have scared me away from the 1.8s.

  6. #6
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    Silver
    1998 Formula

    59cc's is the way to go. Higher compression and cam's not big enough to cause p-v issues.

  7. #7
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    Red
    1987 Trans Am

    Can you guys give me a good idea on the horse power numbers with the different chambers?

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