Bare C5R Racing Cubed Cylinder Head

P/N 25534393

• 355-T7 "as-cast" Aluminum racing head
• Professional porting and machining of combustion chambers required
• No seats or guide machining
• C5R rectangle-port design - requires aftermarket rectangle-port intake manifolds
• Designed for big bore (4.100" min) LS7/C5R/LSX blocks
• 210cc "as-cast" intake ports
• 70cc "as-cast" exhaust ports, same as production LS6
• 30cc "as-cast" combustion chambers
• All fasteners are metric
• Capable of over 800 horsepower!
• Standard LS exhaust port design

Note: Images represent a machined version of the P/N 25534393 cubed (unmachined) product. Chevrolet Performance does not supply a fully machined version of the C5R head. Images are for reference only.

Additional required components:

• 12582179 (2) or 19170419 Gaskets
• 11562524 (20) Bolts
• 12558840 (10) Bolts
• 12571164 Spark Plug

Engine application: C5R