Aluminum C5R Racing Block

The ultimate GM Performance aluminum LS block, the C5R was originally designed for the Chevrolet 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 non-production, 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!

P/N 12480030

• 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
• 340 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

Note: HIP is the acronym for Hot Isostatic Pressure. This process puts the blocks in a sealed vessel where a vacuum is first used to remove room air and any possible contaminants. The vessel is filled with high pressure nitrogen (up to 30,000-psi) and then heated to the required temperature and sustained for a determined amount of time. The cooling process is also a controlled procedure to ensure maximum strength and proper heat treat. This extreme high pressure and heat removes almost 100% of the internal porosities that are generated during the casting process. The material integrity, strength and fatigue life increases significantly.