Chevrolet Performance 12609999 LS Gen IV 6.0L Cast-Iron Bare Block.
12609999 Gen IV 6.0L Cast-Iron Bare Block
Direct replacement for LY6 and L96 production engines
Production cast-iron block
Production oiling system
6-bolt iron main bearing caps
9.240" deck height
No provision for Active Fuel Management
Supports 500+ horsepower!
Origin: Gen IV 6.0L
Deck Height: 9.240”
Main Cap Material: Iron
Crank Journal Diameter: Standard LS 2.56”
Oiling: Wet or Dry
Rear Main Seal: 1 Piece
Maximum Stroke: 4.00”
Maximum Horsepower: 500
PRODUCTION CYLINDER BLOCKS
The LS-Series cylinder block is the foundation for the serious performance achievements that are driving a new generation of street and racing enthusiasts. Features include a deep-skirt casting (the block side extends below the crankshaft centerline); 6-bolt cross-bolted main caps, strong and lightweight aluminum alloy casting (most production blocks) and provisions for the latest in engine control management. The cam-in-block configuration brings inherent torque to every LS engine, with production-based blocks capable of supporting combinations of 500 horsepower or more. The Corvette ZR1’s unique 6.2L block, for example, supports the engine’s 638-horsepower rating. Chevrolet Performance’s high-performance iron LSX cylinder block supports more than 2,000 forced-induction horses!
Whether you’re building a mild street engine or an Outlaw racing engine, starting with a strong LS cylinder block brings the assurance that you’ll make the power you need with a durable foundation.
Chevrolet Performance TECH SPOTLIGHT: LS AND LT CYLINDER BLOCK DESIGN
One of the biggest design differences between the original Gen I/Gen II Small-Block and the Gen III/Gen IV “LS” engines and the recently introduced Gen V “LT” Small-Block is the long-skirt block casting of the LS and LT versions.
Also known as a Y-block design, because of the profile it creates, it’s defined by the casting’s extension below the centerline of the crankshaft. The primary reasons for it are strength and rigidity. By extending the block below that dimension, the crankshaft’s location is secured further with crossbolted main bearing caps. The Gen I/Gen II Small Block main caps are located with two or four vertical fasteners. With the LS and LT blocks, there are four conventional vertical fasteners, along with two additional horizontally located cross bolts.
Additionally, the long-skirt design adds rigidity to the block – particularly with the cross-bolted main caps – that contributes to smoother overall performance. Evolution of the basic LS/LT block has improved the bay-to-bay breathing capability between the sections of the block separated by the main caps, meaning there’s less power-robbing windage in the latest versions, which optimizes performance in blocks design to support great power capability with strength and refinement.
This same design is incorporated into the GEN IV-style LSX iron block from Chevrolet Performance. This rugged design also incorporates a 6-bolt cylinder head to apply additional clamp load for nitrous, turbo-charged and supercharged applications. The Ultimate LS block!
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Expires on: 01/11/2017
Posted: 10/19/2016, ad expires in 81 days
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