Audi 4.2L 32V St/RS4/RS5/R8 Chain Engine Supertech Valve & Spring Packages

Supertech Valve and Spring packages for the 32V 4.2L chain driven variant engines.  Kit Options: Kit 1 (Valve Kit, keepers are required as factory triple groove will not work): 16 Inconel Standard Size Exhaust Valves 16 Black Nitride Standard Size Intake valves 64 Single Groove Keepers Kit 2 (Spring Kit): 32 HD Springs 32 Titanium Retainers Kit 3 (Valve & Spring Kit): 16 Inconel Standard Size Exhaust Valves 16 Black Nitride Intake Valves 64 Single Groove Keepers 32 HD Springs 32 Titanium Retainers