TOMEI Solid Pivot SR20DET In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming at higher RPM ranges and for higher horsepower output from engine modifications, it is important to improve the reliability of head system parts and to make valve drive train set correctly for the suited cam profile. So it is necessary to eliminate the use of the hydraulic lash adjusters. Tomei have adopted the solid pivot system to enable adequate cam clearance adjustments while keeping total height of pivot of each cylinder fixed. Therefore it is possible to build a more precise head system in a shorter time compare to the other conventional methods. Improvements in the reliability and lower pricing were made possible at the same time by having reduced the number of parts required. 4G63 Mitsubishi had chosen to use the lash adjuster (hydraulic system) for the 4G63 cylinder head for mass production efficiency, maintenance free and quieter operation. The best way to get more power from the 4G63 engine is to convert it to the solid system which is by far more superior in allowing running more aggressive camshaft profiles. The Solid conversion helps with more efficient opening and closing of the valves and therefore helps improve response throughout higher RPM ranges. This product has a height adjustment function via a screw lock system which eliminates the use of shims so costs are reduced and improves running efficiency. This is best used in conjunction with the other solid upgrade products from Tomei Powered for the 4G63. Features Improved Response With the especially designed cam profile characteristics, with the touch of the throttle you will realize the amazing response and improvements in efficiency of the best valve timing. Designed for high end RPM use. The solid conversion will eliminate the dullness experienced at high RPM when using the hydraulic adjustable type. Special Camshafts and Valve Springs The solid conversion will also require the appropriate solid type camshafts to be used with the solid pivots. Also since the solid camshafts are designed with higher cam lifts, our Tomei valve springs will also be required to provide the adequate clearance and appropriate spring rate (Sold separately). All types of competition use. With serious race competition where every second counts in Drag, Circuit Time Attack, one make race or GT events, a solid conversion is required to get that extra gain over your rivals. For Monster Power Cars The 270° and 280° solid type camshafts will utilize the full potential of the large size turbo units. NISSAN Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes 1991 - 1999 180SX S13 L4 2.0 T SR20DET GAS 1989 - 1994 240SX ALL ALL ALL ALL ALL ALL w/ SR20DET Swap 1995 - 1998 240SX ALL ALL ALL ALL ALL ALL w/ SR20DET Swap 1989 - 1994 SILVIA ALL ALL ALL ALL ALL ALL 1995 - 1998 SILVIA ALL ALL ALL ALL ALL ALL 1999 - 2002 SILVIA ALL ALL ALL ALL ALL ALL