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Chevrolet Performance LSX Series Engine Blocks


Chevrolet Performance
Chevrolet Performance LSX Series Engine Blocks


Delivering the seemingly impossible combination of professional race-level strength with entry-level affordability, the LSX Bowtie Block is the next revolution in high-performance engine building. This durable iron block is based primarily on GM's production LS7 block but cast with more material in key areas, including a thicker deck and bores, to support 454 cubic inches or more. Unique six-bolts-per-cylinder-head clamping capability permits forced induction and nitrous combinations of greater than 2,000 horsepower.

Because the LSX Bowtie Block is based on production LS blocks, all LS-Series Gen IV cylinder heads, crankshafts, oil pans, camshafts, and accessories bolt right to it. There's a tall deck version to build larger engines, and Chevrolet Performance even offers the LSX Bowtie Block semi-finished so you can do it your way. Whether building a ''tame'' 500 HP street engine for your hot rod or a 1,700 HP turbo engine for an Outlaw drag racer, the LSX Bowtie Block is the foundation for an unbeatable combination at an unbeatable price!

LSX Bowtie Block Specifications
  • CNC-machined cast iron block
  • True priority main oiling
  • 6-head bolts per cylinder
  • Standard 4.400'' bore spacing
  • Extra-thick siamese cylinder bores
  • Semi-finished, machined thicker decks
  • LS7-style, 6-bolt dowel-located billet main bearing caps
  • Wet-sump and dry-sump oiling capability
  • Production-style deep-skirt head bolt holes
  • Production bolt hole and thread sizes
  • Maintains production exterior accessory mounting provisions
  • Front motor plate mounting holes added
  • Additional material cast around cam bearings for greater strength
  • 8mm exterior/interior fifth- and sixth-head bolt holes
  • Standard 0.842'' lifter bores
  • Accommodates all LS oil pumps and oil pans
  • External oil pump feed (rear of block)
  • Main web bay-to-bay breathing holes to support greater horsepower
  • Includes unique cam retainer, rear cover and lifter retainers
  • Powdercoated orange

    For the advanced competition engine builder, the new LSX Bowtie Block also features:
  • Front oil feed holes can be plugged/restricted for mechanical flat tappet or mechanical roller lifter applications
  • Can be machined safely to 9.200'' deck height
  • Maximum 4.200'' bore at .200'' minimum wall thickness (naturally aspirated applications)
  • Head bolt holes can be machined for 1/2'' studs
  • Cam bores can be machined to accept 60mm roller bearings
  • Can be machined for larger diameter lifters and/or 1.060'' bronze bushings
  • Front oil feed lines can be plugged and external oil pump and/or aftermarket dry sump systems can be used via oil pump feed at rear of block (may be required with certain large stroke/aluminum rod combinations)
  • Belt cam drive systems can be accommodated (some machining will be required)
  • Front motor plate can be used for racing chassis applications (Sprint Car, drag racing, truck pulling, etc.)
  • Threaded water plugs can be used for external heaters or coolers
  • Extra stock for main bearing align-honed
  • 400 mPa Tensile strength iron
    JEGS Easy Kits are designed by JEGS professionals so you get all the parts you need!


  • 7 Products
    Finished Engine Blocks
  • Fully CNC-Machined
  • Deck Plate Honed
  • Align-Honed Main Bearings
  • Finished 9.240'' Deck Height

  • 809-19260095
    LSX376 Engine Block
  • Standard Deck
  • 4.065'' Bore
  • 9.240'' Finished Deck Height
  • Billet-Steel Main Caps
  • Includes All Hardware
  • Used in LSX376 Crate Engine
  • $119
    $2,868.99
    Ships

    809-19260099
    LSX454 Engine Block
  • Standard Deck
  • 4.185'' Bore
  • 9.240'' Finished Deck Height
  • Billet-Steel Main Caps
  • Includes All Hardware
  • Used in LSX454 Crate Engine
  • $119
    Was: $2,729.99
    Now: $2,676.99
    Ships
    Semi-Finished Engine Blocks
  • Semi-Finished Deck Height (Ready to be Decked)

  • 809-19260093
    LSX Engine Block
  • Standard Deck
  • 3.880" Finished Siamese Bore
  • 9.260" Semi-Finished Standard Deck Height
  • 4.250" Maximum Stroke
  • Capable of 364-482cid
  • Accepts all LS & LSX heads, cranks, cams, etc.
  • Approximate Finished Weight: 225 lbs
  • $119
    Was: $2,502.99
    Now: $2,454.99
    Order Today Ships 08/05/14

    809-19260100
    LSX Engine Block
  • Tall Deck
  • 3.880" Finished Siamese Bore
  • 9.720" Semi-Finished Tall Deck Height
  • 4.500" Maximum Stroke
  • Capable of 364-500cid
  • Accepts Gen IV LS & LSX heads, cranks, cams, etc.
  • Approximate Finished Weight: 225 lbs
  • $119
    $2,686.99
    Ships
    Block and Rotating Assembly Kits

    809-19260093K
    LSX Block and Rotating Assembly Kit
  • Semi-Finished Engine Block #809-19260093
  • LSX454 Rotating Assembly #809-19259254
  • $119
    Easy Kits
    Was: $5,798.99
    Now: $5,685.99
    Order Today Ships 08/05/14

    809-19260099K
    LSX Block and Rotating Assembly Kit
  • Finished Engine Block #809-19260099
  • LSX454 Rotating Assembly #809-19259254
  • $119
    Easy Kits
    $5,907.98
    Ships
    Accessories

    809-12573460
    Oil Galley Plug
  • Fits LS Series Engines
  • $6.99
    Ships

    7 Products