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Thread: LSX Block on Motor Plates

  1. #1
    Senior Member MASTER BUILDER TheEngineer's Avatar
    Join Date
    Sep 2007
    Moore Oklahoma

    LSX Block on Motor Plates

    I'm currently running a SBC engine with motor plates in my tube-chassis car. And, I'm thinking about building a large CI, LS engine using one of the new GMPP LSX blocks and was wondering "exactly" what the difference in length will be between the current SBC block and the LSX block (mid-plate to front-plate)?

    Also, according the the GMPP webpage, the LSX short-deck (9.260") block can handle a maximum of 4.25" bore and 4.25" stroke! Now, this is some serious CI potential in what is still considered a small-block!

    "There is no replacement for displacement."


  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Warren, i too am thinking about building a LSX engine, according to the artice below they will handle a 4.5 stroke, for 511 CI, also here are the dim. of the block and other related parts. on a LS1.


    At the 2006 SEMA show, GM Performance Parts introduced the LSX engine, an all-new cast-iron racing block based on the LS7 engine. It was designed with help from drag racing legend Warren Johnson. It offers displacements ranging from 364 cubic inches to 511 cubic inches (4.25 in (108 mm) Bore x 4.5 in (110 mm) Stroke) and is capable of withstanding 2,500 bhp (1,900 kW). This block incorporates two extra rows of head-bolt holes per bank for increased clamping capacity. The six bolt steel main caps are the same ones used on the LS7 engine. The engine debuted at the auto show in a customized 1969 Camaro owned by Reggie Jackson. The LSX will be available starting the second quarter of 2007, set to be available in authorized dealerships and retailers on March 31, 2007.[9]

    Gen III LS1

    Block Length: 519.0 mm
    Block Width: 460.0 mm

    Block Deck height: 9.240 inches

    Firing Order: 1-8-7-2-6-5-4-3
    Cylinder bank offset: 0.9488 inches

    Block design/main cap mounting: Deep skirt engine block with 4 vertical and 2 side fasteners in the main caps

    Rotation sensors: Engine block mounted crank and cam location sensors

    Weight: 430 lbs for complete LS1 (Add 88 lbs for iron truck block)

    Weight of Bare block: 103 lbs

    Connecting Rod: 6.098 inches long. On-center beam rod

    Piston-pin diameter: 0.940 inch

    Crank thrust bearing location: No. 3 (center) main bearing

    Oil Pump: Gerotor, driven off front of crank

  3. #3
    Senior Member MASTER BUILDER TheEngineer's Avatar
    Join Date
    Sep 2007
    Moore Oklahoma
    This is a photo of the new GMPP LSX 454R! With new drag race heads and new design intake with a 1150 Dominator. I think it makes about 800 HP! And, the front of the new LSX block has some additional bolt-holes for a front motor plate.

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