Supertech B48 Exhaust Valve Set for Gen 3 F54 F55 F56 F57 F60 Cooper S with 4 Cylinder B48 engine. Crafted from a one-piece forging, these valves undergo a meticulous two-step forging process to ensure superior grain flow and strength. Precision is priority, which is why each valve is CNC machined in multiple steps for exact dimensions. To enhance durability, we apply an additional heat treatment for stress relief, followed by a specialized nitride hardening treatment or coating tailored to your application. The final touch is a precision grinding process and a patented Superfinishing technique, guaranteeing flawless surfaces and perfect dimensions. Choose Supertech racing valves for unmatched reliability and performance that will give you the competitive edge. These are standard size exhaust valves.
Specs:
Head Diameter: 28.5mm(std)
Material: Inconel-Nimonic / Sodium Filled
Groove Type: Single Groove
Length: 100.1mm
Stem Diameter: 5.95mm
NOTE: These are single groove keeper valves, so you can NOT use the stock keepers.
