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LS1 with 6.0 heads question

This is a discussion on LS1 with 6.0 heads question within the Internal Engine forums, part of the LSx Technical Help Section category; hi i have a 2002 ws6 trans am with a sts turbo system im am putting LQ9 heads on it ...

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    Member aquickfive0's Avatar
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    pewtr
    2002 Trans am WS-6

    LS1 with 6.0 heads question

    hi i have a 2002 ws6 trans am with a sts turbo system
    im am putting LQ9 heads on it to lower my compession, does any1 know what it will lower to? does it add or loose horse power? will my stock valve covers and rockers fit on there?

    please tell all that can help?

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    Gold Member BlwnCamaro's Avatar
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    Quote Originally Posted by aquickfive0 View Post
    hi i have a 2002 ws6 trans am with a sts turbo system
    im am putting LQ9 heads on it to lower my compession, does any1 know what it will lower to? does it add or loose horse power? will my stock valve covers and rockers fit on there?

    please tell all that can help?

    The combustion chambers on the lq9 heads are right at 73cc where as the stock ls1 heads are around 67cc I believe. Your compression should drop from 10:1 to about 9.4:1 depending on the thickness of the headgasket you use. A thicker headgasket may yield around 9.2:1, invest in some good headgaskets also. Yes your valve covers and rockers should fit fine. You may lose just a little power with the compression drop but in the bigger picture you will have more power with your turbo cause you could run higher boost levels more safely. Plus the aluminum lq9 heads have similar port configurations as the ls6 corvette heads so consequently they flow pretty decent for stock, and would respond great to a port job also. Also since it will be apart if your budget allows get a good cam that is set up for boost. Generally cams that have good duration, and lift with a tight lob separation work good with boosted applications. However with a stock bottom end having some overlap in the cam will lose some boost and horsepower but will put less cylinder pressure on the stock bottom end. If your on a budget the
    ls6 cam with valve springs is pretty cheap and actually works decent with boost, however if your budget allows I would consult comp or other reputable companies that could grind you a custom boost friendly cam or point you in the direction of a good grind that fits your needs and application for the car. You would also need good valve springs, hardened pushrods, ideally good lifters and a ported and shimmed ls6 oil pump or similar. Plus if you are gonna have the engine out I would invest in arp studs and rod bolts for the bottom end. Good luck.

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    Member aquickfive0's Avatar
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    pewtr
    2002 Trans am WS-6

    this is gona be a in car head swap

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    Member GA Country Boy's Avatar
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    Good advice BlwnCamaro! I think you're right on the money with everything you said. BTW, I've never worked on a 'F' Body...can you do heads and/or cam without pulling the motor?
    Michael
    In GA waving from '02 C5 LS1, Z51, D1SC, 60lb injectors,RPM level 5-4L60E, 3:42, Yank 3600, QA1-12 ways, MTI long headers, high flow cats, Borlas, Wilwood, 603rwhp, 542rwtq.(DynoJet 248-C) 10.89@127.57 on street tires, Race Weight 3,640 lbs

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    Member cailey37's Avatar
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    Quote Originally Posted by GA Country Boy View Post
    Good advice BlwnCamaro! I think you're right on the money with everything you said. BTW, I've never worked on a 'F' Body...can you do heads and/or cam without pulling the motor?
    Yep.....heads and cam can be done without having to pull the motor.......

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    Member SSmoky01's Avatar
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    Quote Originally Posted by cailey37 View Post
    Yep.....heads and cam can be done without having to pull the motor.......
    I second that.
    2000 SS #1827,NBM,A4,leather,t-tops,lid,eibach springs,hotchkis lca's,slp lid,slp cold air induction,slp loudmouth,baer brakes up front,13.11@107 on street tires,12.90@109 on dr's....time for the cam and intake to be installed

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    Member GA Country Boy's Avatar
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    Quote Originally Posted by cailey37 View Post
    Yep.....heads and cam can be done without having to pull the motor.......
    Damn! That's the way it should be!!! I guess I'm so used to Y-bodies where it seems that the drive train gets pulled for just about everything. BUT they can't fool me! When they tell me they have to pull it to change the oil, I just wont let
    that happen. I KNOW I'm NOT due for an oil change yet!!!

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