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Thread: HELP???? Looking to build an LS1/LSX Bottom End,

  1. #1
    Senior Member RACING JUNKIE
    Join Date
    Nov 2004
    Location
    St. Louis, Missouri
    Posts
    664

    HELP???? Looking to build an LS1/LSX Bottom End,

    I am getting ready to build a healthy bottom end for my sons vette. It has an LS-1 in it right now, Any guideance would be appreciated
    Block type, LS-1 LSX ???
    Aluminum or cast block??
    Planning on a little bit of nitrous and a small roots blower
    rotating combos etc.

    Looking to make approx. 1000 hp.
    All comments are appreciated...
    "Can't Means You Don't Want To"

    Haven't You Stomped A Ford,,,,,,,,,,,, Lately?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    A vette motor? No way!
    -WJ Birmingham

    OneBadGMC.com

  3. #3
    If you want any more then a 3.750 stroke stay away from a LSX block, the sleeves are very short!!!!!!!!!

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Nov 2004
    Location
    St. Louis, Missouri
    Posts
    664
    hoping to use a 3.625 stroke
    "Can't Means You Don't Want To"

    Haven't You Stomped A Ford,,,,,,,,,,,, Lately?

  5. #5
    Quote Originally Posted by ARUSSELL
    If you want any more then a 3.750 stroke stay away from a LSX block, the sleeves are very short!!!!!!!!!
    If the sleeves are to short what are they doing when they put a 4.125 crank into a 4.185 bore LSX from GM? It isnt the tall deck, they havent even come out with it yet. Are you saying that the piston comes out of the bottom of the sleeve to far??

  6. #6
    Quote Originally Posted by supergass
    Quote Originally Posted by ARUSSELL
    If you want any more then a 3.750 stroke stay away from a LSX block, the sleeves are very short!!!!!!!!!
    If the sleeves are to short what are they doing when they put a 4.125 crank into a 4.185 bore LSX from GM? It isnt the tall deck, they havent even come out with it yet. Are you saying that the piston comes out of the bottom of the sleeve to far??
    By the numbers you can get a 4.250 stroke in, but the piston comes out of the bottom of the bore so much that the pistons colapse the skirts quick. Im am not saying it cant be sone, but you wont be happy with the life of the engine.

  7. #7
    Quote Originally Posted by ARUSSELL
    Quote Originally Posted by supergass
    Quote Originally Posted by ARUSSELL
    If you want any more then a 3.750 stroke stay away from a LSX block, the sleeves are very short!!!!!!!!!
    If the sleeves are to short what are they doing when they put a 4.125 crank into a 4.185 bore LSX from GM? It isnt the tall deck, they havent even come out with it yet. Are you saying that the piston comes out of the bottom of the sleeve to far??
    By the numbers you can get a 4.250 stroke in, but the piston comes out of the bottom of the bore so much that the pistons colapse the skirts quick. Im am not saying it cant be sone, but you wont be happy with the life of the engine.
    Well thanks so much, that is good information!! I was poised to buy a LSX for a 454 at the beginning of the month! Its hard to find anyone who has a little experience on these things yet. Thanks again!!

  8. #8
    The piston problem has been addressed by a lot of manf. with shorter skirt designs and pin movement

  9. #9
    Quote Originally Posted by unlucky13
    The piston problem has been addressed by a lot of manf. with shorter skirt designs and pin movement
    The piston skirt can only be so short before the piston will roll over

  10. #10

    LS Motor

    There is lots of info on these motors. The stock LS1 aluminum block is reliable to around 700-750HP before cracks may be reported. I have seen some go farther, but don't know the longevity factor. A lot of guys are using the LQ9 or LQ4 cast iron blocks with good success. My last 2 turbo builds were 370"-4.030"X3.662", LQ9's. They are relatively cheap. The stock cranks have lived well in excess of 1000HP. Both easily made over 1000HP. If you are looking for a reliable driver, 700-800HP might be less expensive and more reliable. Your drivetrain is definately a large expendature to bring up to task.

    If you insist on your LS1 aluminum block, debur the ENTIRE BLOCK and get checked. Get the mains pinned, I've used the DM Performance Girdle, Callies 4" Crank and Rods, Diamond COATED Pistons, (any quality manufacturer will do), all ARP STUDS and hardware, LS9 Head Gaskets up to around 750-800HP, after that O-Ring the block and heads w/copper gaskets. Install bigger diameter head studs-for the boost and N20. Not much different than any other block. Lots of great heads that flow phenomenal out there. Depending on CI, 215-235 range. And 1 7/8"-2" primaries on your headers. Pick up GM High Tech Magazine. It's the Bible for the LS guys. Lots of good info, if you are starting out.

    Every engine builder has there own preferences. Due diligence will find a good one in your neighborhood. There are enough good packages to attain your goals. Good Luck.

  11. Racing Junk


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