Mazworx Shimless SR20VE Intake and Exhaust Valves are recommended for High RPM, High Power applications. Retainers require machining.
Intake valves: +1mm (35.15mm) x 6mm stem
Inconel Exhaust valves: +2mm (31.15mm) s 6mm stem
P12 heads are required to change to 6mm guides.
Lashing is done by tipping of the valve.