Aluminum C5R Racing Block
The ultimate GM aluminum LS block, the C5R was originally designed for Chevrolet’s factory-backed Corvette racing program. It was developed to support more than 440 cubic inches and up to 900 horsepower – and it proved itself by powering the Corvette team to wins at LeMans, Daytona and nearly every track they encountered. This is a nonproduction, purpose-built cylinder block manufactured with proprietary materials and machined to the highest tolerances – and using premium,
racing-spec hardware. If you’re looking for the ultimate aluminum cylinder block to support your horsepower desires, the race-proven C5R is it! • Premium “hipped”* and X-rayed 356-T6M aluminum-alloy block casting

• 9.240" deck height
• Production-style oiling system
• 6-bolt dowel-located steel main bearing caps
• 4340 premium map cap fasteners
• For use with any LS or LSX series head
• Unique cylinder liner material for maximum durability
• Siamesed cylinders to support larger bores
• 4.117" finished bore
• 4.160" maximum bore
• Fully blueprinted and squared
• Production camshaft location and cam bores
• Includes premium head studs
• Anodized aluminum O-ring core plugs
• No Active Fuel Management provisions
• Supports more than 900 horsepower

Origin: C5R
Part Number: 12480030
Material: Aluminum
Ceck Height: 9.240
Bore: 4.117–4.160"
Main Bolt: 6
Cap Material: Steel
Crankshaft Jnl Dia: Std. LS (2.56)
Oiling: Wet/Dry
Rear Main Seal: 1 pc
Max Stroke: 4.10"
Max HP: 900
Usage: Pro

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