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GM CHEVY LS SERIES block

Part Material Deck Bore Main Cap Crankshaft Oiling Rear Main Main Max Max Hp Usage Origin Page Number Height Bolt Material Jnl Dia. Seal Bulkhead Stroke Number
12561166 Alum 9.240" 3.89" 6 Nodular Std. LS (2.56) Wet/Dry 1 pc Solid 4.125" 450 Street LS1/LS6 222
12572808 Iron 9.240" 3.98" 6 Nodular Std. LS (2.56) Wet/Dry 1 pc Solid 4.125" 500 Street LQ9 222
12568950 Alum 9.240" 4.00" 6 Nodular Std. LS (2.56) Wet/Dry 1 pc Solid 4.125" 450 Street LS2 223
12584727 Alum 9.240" 4.065" 6 Nodular Std. LS (2.56) Wet/Dry 1 pc Windowed 4.125" 500 Street L92 223
17802854 Alum 9.240" 4.125" 6 Steel Std. LS (2.56) Wet/Dry 1 pc Windowed 4.125" 500 Street LS7 224
25534427 Alum 9.240" 4.125" 6 Steel Std. LS (2.56) Wet/Dry 1 pc Solid 4.125" 500+ Street LS7 224
12480030 Alum 9.240" 4.117"–4.160" 6 Steel Std. LS (2.56) Wet/Dry 1 pc Windowed 4.125" 900 Pro C5R 225
19166454 Iron 9.260" 3.990"–4.250" 6 Nodular Std. LS (2.56) Wet/Dry 1 pc Windowed 4.250" 1000+ Pro/Am LSX 227

GM took a chance with the LS engine. They stayed true to the pushrod small-block and continued to develop this technology to the point that building a daily-driven, 500-plus horsepower car is no big deal. The GM Performance Parts LS Series cylinder block are designed specifically for late model small-block engines that run the LS Family cylinder heads. These include the LS1, LS2, LS4, LS6, LS7, LQ4, LQ9, and L76. Our LS block selection ranges from a stock replacement all the way up to our LSX Bowtie block designed to support 2500 horsepower!

A. 12561166 REDUCED PRICE!
LS1/LS6 5.7L Bare Block
• Direct replacement for 2001–2004 LS1 and LS6 Corvette 5.7L
• Production 319-T5 aluminum block with iron sleeves
• Production oiling system
• 6-bolt iron main bearing caps
• 9.240" deck height
• Use LS1/LS6 cylinder heads only
• 3.89" finished bore (99.0mm)
• No provision for ‘Active Fuel Management’
• Tested to over 400 hp!

12572808
LQ9 Cast Iron 6.0L Bare Block (not shown)
• Direct replacement for 1998–2004 LQ4 and LQ9 Truck and SUV 6.0L
• Production cast iron block
• Production oiling system
• 6-bolt iron main bearing caps
• 9.240" deck height
• Use only LS1, LS6, LS2 or L76 cylinder heads
• 4.00" finished bore (101.6mm)
• No provision for ‘Active Fuel Management’
• Tested to over 500 hp!

12568950
LS2 Aluminum 6.0L Bare Block (not shown)
• Direct replacement for 2005–2007 LS2 Corvette, SSR, GTO 6.0L, and Trailblazer SS
• Production 319-T5 aluminum block with iron sleeves
• Production oiling system
• 6-bolt iron main bearing caps
• 9.240" deck height
• Use only LS1, LS6, LS2, L76 or C5R cylinder heads
• 4.00" finished bore (101.6mm)
• Provisions for ‘Active Fuel Management’
• Great for stroker cranks for even more cubes
• Tested to over 450 hp!

12584727 NEW
L92 Aluminum 6.2L Bare Block (not shown)
• Direct replacement for 2007 L92 6.2L
• Production aluminum block with iron sleeves
• Production oiling system
• 6-bolt iron main bearing caps
• 9.240" deck height
• Use only LS1, LS6, LS2, L76 or C5R cylinder heads
• 4.065" finished bore (103.25mm)
• Great for stroker cranks for even more cubes

The LS Series block Continued

17802854
LS7 7.0L Corvette Bare Block (not shown)
• Direct replacement for 2006–2007 7.0L LS7 engine
• Production 319-T5 aluminum block with pressed-in iron sleeves
• Production oiling system
• 6-bolt ‘dowel located’ steel main bearing caps
• 9.240" deck height
• For use with any LS series head
• 4.125" finished bore (104.78mm), deck plate honed
• Siamese cylinder bores for large bore size
• No provision for ‘Active Fuel Management’
• Based on C5R block development
• Tested to over 500 hp!
Parts required to complete your LS7 Block

PART NUMBER QTY DESCRIPTION
12570471 1 Valley cover
12598292 1 Front cover assembly
21007339 4 Plug
12556437 1 Camshaft retainer
11609289 1 Plug
11610259 1 Plug, cylinder head
12551177 5 M8x1.25 flanged hex head bolt
12570326 4 Dowel, cylinder head locating
12572013 1 Rear cover assembly
12573460 1 Oil plug
12596334 1 Windage tray
11588426 2 Plug
09427693 4 Plug
01453658 2 Dowel, bell housing locating
12561663 1 Plug
12573107 1 Oil pressure sensor
12585546 1 Crankshaft position sensor

25534427 NEW
LS7 Bare Block with Solid Main Bulkheads (not shown)
• 319-T5 aluminum block with pressed-in iron sleeves
• Production oiling system
• 6-bolt ‘dowel located’ steel main bearing caps
• 9.240" deck height
• For use with any LS series head
• 4.125" finished bore (104.78mm), deck plate honed
• Siamese cylinder bores for larger bore sizes
• No provision for ‘Active Fuel Management’
• Fully machined with caps and pressed-in liners
• Limited availability
• Perfect for racing dry-sump applications
• Made to LS7 production standards for machining and cleanliness
• Based on C5R block development
• Tested to over 500 hp!

   A. 12480030
Aluminum C5R Racing Block
This is the ultimate race version of the aluminum LS block, which enjoys the state-of-the-art technology necessary to build an LS engine to over 440 cubic inches, and 900 horsepower! Our C5R race block has seen serious race time (including wins at LeMans, GT-S, and the 24 hours of Daytona). If you are building a “big” small block for your late model Camaro, Firebird, or Corvette, this is the aluminum block for you.
• Premium “hipped” and x-rayed 356-T6M aluminum block
• Production oiling system
• 6-bolt SAE 8620 dowel located steel main bearing caps
• SAE 4340 premium main cap fasteners
• 9.240" deck height
• For use with LS1, LS6, LS2, L76, LS7 and C5R cylinder heads
• C5R spec, special material cylinder liners
• Siamesed water jackets for larger bore size
• 4.117" finished bore
• 4.160" max bore
• Standard camshaft location and bore sizes
• 100% CMM measured for accuracy• Completely “blueprinted” and “squared”
• Included 4340 premium head studs
• AN O-ring plugs throughout
• Capable of over 900 horsepower!

GM LSX BOWTIE BLOCK NEW

The next generation of high performance GM block has been released! It’s the amazing LSX Bowtie Block, designed from the ground up to deliver maximum value while providing you with the foundation to build the LS engine of your dreams. GM Performance Parts, working with NHRA Pro Stock legend Warren “The Professor” Johnson, designed the LSX block to be the ultimate high performance LS block. Our goal was to bring the LS community race block technology at street car prices. Just like every engine part in the GM Performance Parts portfolio, the LSX Bowtie Block is held to the highest industry standards for tolerances, materials, and construction. We think that you’ll find the LSX to be the ultimate in high performance LS engine block—check out these 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 spec’s
• Increased Deck Thickness
• LS7 Style 6-Bolt “dowel located” main bearing caps
• Wet Sump and Dry Sump Capability
• Deep Skirted Head Bolt Holes (same as OEM aluminum block)
• 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 Additional Strength
• 8mm exterior/interior 5th and 6th head bolt holes
• All 5 cam bores machined for bearing P/N 12453169
• Standard .842" lifter bores
• Screw-in soft plugs
• Accommodates any LS small block oil pan 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 Unique New Cam Retainer, Rear Cover, Lifter Retainers and OEM replacement Cam Bearings

19166454
LSX Bowtie Block (Standard Deck)
• 3.990" finished Siamese Cylinder Bores (ready to be honed to your specifications)
• 9.26" semi-finished standard Deck Height (ready to be decked to your specifications)
• Max 4.250" recommended Stroke
• Capable of 364 to 482+ cid
• Orange Powder Coat finish
• Accepts all Gen III & IV LS Heads, Cranks, Cams, Etc.
• Approximate Finished Weight: 225 Lbs. (Standard deck)

The LSX Block includes the following:
19166177 Cam Thrust Plate
19166178 Rear Cover
19166182 Tappet Guide

For the advanced LSX competition engine builder, you will fully enjoy reading the following features of the new LSX Bowtie Block:
• Front oil feed holes can be plugged/restricted for mechanical flat tapped or mechanical roller lifter applications
• Can be machined safely to 9.20" deck height
• Main Bearing Cap bolt threads can be machined for aftermarket premium 12mm fasteners
• Maximum 4.250" bore at .200" minimum wall thickness (naturally aspirated applications)
• 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 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
• External oil pump feed at rear of block
• 7th transmission bolt hole has been added (per early SBC), stud can be installed for sanctioning body requirements
• 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

The LSX block made its public debut at the 2006 SEMA show in the Reggie Jackson ’69 Camaro project car—a joint effort between GM Performance Parts and GM Performance Division. This car also starred in a Hot Rod TV episode—the first to air on ESPN. The engine that powers this amazing “evolved Camaro” features a 454-cubic-inch LSX short block, prototype LSX cylinder heads, an LS7 carbureted intake manifold, a pump gas-friendly compression ratio, and over 640 horsepower. This is just a sample of what you can do with your own LSX block!

Look for the LSX block to spawn LSX-specific cylinder heads, intakes, cams, and crate engines. And, watch for GM Performance Parts to continue to lead the industry in value-based high performance engine block, components, and crate engines.