ls lt lsx block engines

LS/LT/LSX SERIES
BLOCKS AND COMPONENTS

The people’s champ

From cruisers to pickups, factory-engineered power can make every hot rod a winner.

PRODUCTION CYLINDER BLOCKS

Whether you’re building a simple street engine or a drag-racing engine, starting with a strong LS cylinder block assures thrilling performance.   

LSX Bowtie Block

Combining professional racing-level strength and entry-level affordability, the LSX Bowtie Block is our latest evolution in high-performance engine building.

LSX Bowtie Block Specs and Features

  • 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
  • 8 mm 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

New LSX Bowtie Block 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

CYLINDER BLOCK
COMPONENTS

FRONT COVERS
  

  REAR COVERS
   


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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.