Valvetrain

Supertech retainers are manufactured with high quality military certified Titanium alloy, and are CNC machined for a tight fit. Supertech's high quality retainers are among the best in the industry. These fit all SR20s except the P12 8H6 head with 5.5mm valve stems.

Our Valve Guides are precision-machined from high quality Manganese Bronze material.For Exhaust guides for high powered engines that need a better thermal transfer coefficient, Supertech uses a copper alloy. Copper has about 3 times higher thermal transfer than Manganese Bronze

All Supertech valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high rpms. Using high quality steel alloy also provides the added benefit of better structural memory for all of valve springs.Supertech dual valve springs are designed and manufactured to reduce valvetrain harmonics, increase durability, and provide an increase in performance for your high performance racing engine.

This valvetrain kit is for the P11 SR20VE heads (1N5) with 6mm valve stems. Basic kit comes with Titanium Retainers and Dual Valve Springs. Choose your upgrades. For all motor applications, we recommend not going higher than 83lb springs.

This valvetrain kit is for the SR20DE/DET heads except the GTi-R. Basic kit comes with Titanium Retainers and Single Springs. Choose your upgrades. If you have hydraulic pivots, we recommend not going higher than 90lb springs. If upgrading your valve size, we recommend going with the 6mm stem exhaust valves. This will require replacing the valve guides.

Our new SR timing chain tensioner significantly improves upon the factory hydraulic timing chain tensioner which can fail when stiffer valve springs are installed. With the stock tensioner, the installation of bigger cams and stiffer valve springs can also cause excessive timing chain wear and can cause the chain to stretch prematurely. The Mazworx tensioner does not need oil pressure to operate and, when properly adjusted, can function as well or better than a factory OEM tensioner, can...