This valvetrain kit is for the P12 SR20VE heads (8H6) with 5.5mm valve stems.
Basic kit comes with Titanium Retainers, Dual Valve Springs and Inner Spring Seats. The P12 head, from the factory, came with single springs, so you will need inner spring seats to run dual valve springs. Choose your upgrades.
For all motor applications, we recommend not going higher than 83lb springs.