Dream bigger. Because the new GM Performance Parts LSX takes the LS-series V8 to the ultimate extreme. Shaped from 50-plus years of V8 know-how and refined with the speed secrets of Warren "The Professor" Johnson, the LSX block was engineered to handle up to 2,500 horsepower, all for a price that will have the rest of the world wondering how we did it.

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 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 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

Features: 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 blocks, components, and crate engines.

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