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Vehicle Info NeededCHEVROLET PERFORMANCEPART NUMBER: 809-12480030
C5R Racing Bare Aluminum Block Developed for C5R Corvette Racing Program, 900HP
$9,23599
Truck Freight
Ships on 09/14/2026
Lowest Price GuaranteeAluminum Production LS-Series Engine Blocks
- C5R Racing Bare Block
- Developed for C5R Corvette racing program
- Premium "hipped"* and x-rayed 356-T6M aluminum block
- 4.117" finished bore, 4.160" max bore
- Capable of over 900HP!
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! The C5R Race Blcok 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.Notes: - Max HP: 900
- Max Stroke: 4.10"
- Pro Use
- Production oiling system
- 6-bolt SAE 8620 dowel located steel main bearings cap
- SAE 4340 premium main cap fasteners
- 9.240" deck height
- For use with LS1, LS6, LS2, L76, LS7 and C5R cylinder heads
- Siamesed water jackets for larger bore size
- Standard camshaft location and bore size
- 100% CMM measured for accuracy
- Completely "blueprinted" and "squared"
- Included 4340 premium head studs
- AN O-ring plugs throughout
*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.
- Chevrolet 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 HP car is no big deal. The Chevrolet Performance LS Series cylinder blocks 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.********
Part TypeEngine Block
Product LineChevrolet Performance LS Series Engine Blocks
BrandCHEVROLET PERFORMANCE
Package Height19.5
Package Width20.0
Package Length26.0
Weight183.0 PG
Part CategoryPerformance Parts
Main Journal TypeOEM
Engine Block StyleStock/OEM standard Deck
Engine Block MaterialA-356 aluminum
Cylinder Bore As Shipped4.117 in (104.572 mm)
QuantitySold individually
Raised Cam LocationNo
Freeze Plugs IncludedNo
Deck Height9.24 in (234.696 mm)
Main Bearings IncludedNo
Main Cap MaterialSteel
Rear Main Seal Style1-piece
Main Caps IncludedYes
Finished Cylinder BoresNo
Cylinder Bore Diameter4.16 in (105.664 mm)
Cam Bearings IncludedNo
Main Cap Fasteners IncludedYes
Vendor Part Number12480030
Package Qty1
Package TypeEA
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