TOMEI Valve Springs In terms of transferring the exact movement of the camshaft, the highest quality valve spring is required to the high RPM , high powered tuned engines. Tomei developed our products with the most careful choice of the material, coating and the other technologies. Then Tomei repeated severe tests to our pre-production in order to give the best quality that is performed in any situations. Features Reliability in high RPM , and improvement in an initial response High durability against metal fatigue High durability against the shocks from jump and bounce High durability against surging High sag resistance NISSAN Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes 1989 - 2002 SKYLINE ALL ALL ALL ALL ALL ALL