LSX Bowtie Block, Standard Deck


  • 3.880″ semi-finished siamese cylinder bores
  • 9.260″ semi-finished standard deck height
  • 4.250″ maximum stroke (professional engine builders only!)
  • Accepts all LS and LSX Series heads, cranks, cams, etc.


Shipping is free, but there is a delivery fee for residential addresses.

SKU: 19417351 Categories: , ,

LSX Bowtie Block, Standard Deck

P/N 19417351

  • 3.880″ finished siamese cylinder bores
  • 9.260″ semi-finished standard deck height (ready to be decked)
  • 4.250″ maximum stroke (professional engine builders only!)
  • Capable of 364- to 482-cubic-inch displacements
  • Orange powder-coated finish
  • Accepts all LS and LSX Series heads, cranks, cams, etc.
  • Approximate finished weight is 225 pounds

LSX blocks include the following:

  • 19244460 Cam Thrust Plate
  • 19166179 Rear Cover
  • 19166182 Tappet Guides

Other service parts for your LSX:

  • 19166178 Cam Thrust Plate, O-Ring. Gasket
  • 19166180 Rear Cover, O-Ring
  • 19166181 Rear Cover, O-Ring Seal
  • 19211434 Main Cap Dowel (10-piece kit)
Weight 225 lbs



LSX Bowtie Block, Standard Deck

19417351 Chevrolet Cylinder Block

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

Because the LSX Bowtie block is based on production LS blocks, all of the LS-Series Gen IV cylinder heads, crankshafts, oil pans, camshafts, and accessories bolt right up to it. There is also a tall-deck version for building even larger engines. Chevy Performance delivers the LSX Bowtie Block semi-finished, allowing you to finish it to your needs. Whether you’re building a “tame” 500-horse street engine for your hot rod or a 1,700 horsepower turbo engine for an Outlaw drag racer, the LSX Bowtie Block is the foundation for an unbeatable combination ? at an unbeatable price!

Specs and features include:

  • 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

For the advanced LSX competition engine builder, you will fully enjoy the following features of the new LSX Bowtie Block:

  • 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

GM Parts and Components carry a 12-month parts-only limited warranty unless otherwise noted.


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to