HKS Valve Stem Seal Set

With genuine valve stem seals, oil drops will occur at repeated high revs of 9,000 rpm or more.
Therefore, we have commercialized a part designed as a countermeasure against oil drop in DRAG GT-R.
The material of this valve stem seal has been changed to follow the valve even at 10,000 r/min, preventing oil from dropping.
Although it is included in the head system STEP Pro, it can also be used alone for the genuine head specification.

For more details please go through the below link...
HKS Valve Stem Seal Set