Genuine OEM AP2 Retainer Upgrade Kit.
On AP1 engines, it is common for valve retainers to start cracking, causing premature failure of the retainer, leading to valves dropping and catastrophic engine damage.
This kit contains the required quantity for the intake valves, which are more prone to cracking.
If you want to upgrade both intake and exhaust valves, you will need to select 2 units..
