GM Performance Parts Tall-Deck Iron Bowtie Block, 9.720″ Deck Height, LSX

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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 500+ 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!

Features:

• 100% CNC machined cast iron
• True priority main oiling
• 6 head bolts per cylinder
• Standard 4.400″” bore spacing
• Extra thick siamese cylinder bores
• Fully machined bores, ready to hone to fit
• Semi-finished, machined decks, ready to be decked to your specs.
• Increased deck thickness
• LS7 style 6 bolt “”dowel located”” main bearing caps
• Wet sump and dry sump cabability
• Deep skirted head bolt holes (same as OEM aluminum blocks)
• All stock bolt holes are stock thread size
• Maintains all OEM “”LS”” family exterior mounting features
• Front motor plate mounting holes added
• Added material around cam bearings for extra strength
• 8mm exterior/interior 5th and 6th head bolt holes
• All 5 cam bores machined for bearing # 12453169
• Standard .842″” lifter bores
• Screw-in soft plugs
• Accomodated any “”LS”” series oil pand and oil pump
• External oil pump feed at rear of block
• Main web bay to bay breathing holes for increased HP
• Access windows for cylinder head stud access (intake side)
• Extra breathing pocket added near starter for better windage
• Includes new cam retainer # 19166177, rear cover #19166178, lifter retainers #19166182 and OEM replacement cam bearings

Specifics:

• 3.880″” finished siamese bores (ready to be honed to your specifications)
• 9.72″” semi-finished standard deck height (ready to be decked to your specifications)
• Max. 4.375″” reccomended stroke
• Capable of 364 to 500 + C.I.D.
• Orange powder coat finish
• Accepts all Gen III & IV LS heads, cranks, cams etc.
• Approximate finished weight – 225 Lbs

Engine Builder Features:

• Front oil feed holes can be plugged or restricted for mechanical flat tappet or mechanical roller lifter cam applications
• Can be safely machined to 9.70″” deck height
• main bearing cap bolt threads can be machined for aftermarket 12mm fasteners
• Maximum 4.250″” bore (at .200″” wall thickness)
• 6-bolt head bolt pattern (for boosted applications)
• Machined for 8mm inner and outer 5th and 6th head bolts
• Standard bolt holes can be machined for larger diameter lifters and/or bronze bushings
• Front oil feed lines can be plugged and external oil pump and/or aftermarket dry sump oil systems can be used via oil pump feed at rear of block – may be required with certain long stroke & aluminum rod combinations
• Belt cam drive systems can be accommodated (some machining will be required)
• External oil pump feed at rear of block
• 7th transmission bolt has been added (per early SBC) stud can be installed for sanctioning body requirements
• Front motor plate can be used for racing chassis applications
• Threaded water plugs can be used for external heaters or coolers