GM LSX Performance Parts Iron Bowtie Block, 9.240″ Deck Height

LSX Bowtie Blocks deliver the seemingly impossible combination of professional racing level strength and entry-level affordability, the LSX Block is the next revolution in high-performance engine-building. This durable iron-block casting is based primarily on GM’s 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 2000 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. GM Performance Parts 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 1700 horsepower 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 specs and features include the following:

• Latest revision for improved metallurgy that results in upwards of 50% increase in tensile strength throughout the block.
• Latest revision with reinforced deck with strengthened water passages and bolt holes.
• Latest revision for cam oiling passages that allow clocked cam bearings to optimize camshaft oiling in the highest performance applications with huge spring pressures and high loads.
• Fully CNC-machined cast iron block.
• True priority main oiling.
• 6-head bolts per cylinder.
• Standard 4.400″ bore spacing.
• Extra-thick Siamese cylinder bores, ready for final honing.
• 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.
• All five cam bores machined for bearing P/N 19167218 (supplied).
• 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, lifter retainers and production style replacement cam bearings.