Chevrolet Performance 25534393 - Bare C5R Racing Cubed Cylinder Head

The images represent the P/N 25534393 cubed (unmachined) product. Chevrolet Performance does not supply a fully machined version of the C5R head. Image is for reference only.

355-T7 as-cast aluminum racing head

Professional porting and machining of combustion chambers required

No seats or guide machining

C5R rectangle-port designrequires 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