Set of 4 high performance oversize exhaust valves for the Kawasaki GPZ1100 and Z1000J (1981+).
 
These valves have an undercut valve stem that improves head flow without sacrificing strenght and also substantially reduces valve weight, allowing higher RPM and more aggressive camshafts.
These valves are 3g lighter than original valves while increasing the head diameter by 1,5mm.
 
Made of the best grade stainless steel (EV8 / 21-4N) commonly used in all high performance valves used for racing or high strung engines (N/A, turbo or nitrous), these are a great improvement over the standard valves not only in flow but also in strength and heat resistance.
 
Valves are finished with durable black nitride coating to avoid stem wear and increase durability.
 
These valves are 33,5mm (1,5mm oversize) and are designed to work with the original valve seat requiring only usual valve seat machining.
 
Oversize valves are a great way of increasing port flow for modified and big bore engines.
 
Oversize intake valves also available.