Description 20V 4age – Exhaust camshaft seal x1   This listing for a singular exhaust camshaft seal x1. – Both the Silvertop and Blacktop 20V 4age engine variants use this type of seal on the exhaust cam, the intake side uses a different model of seal which is available on it’s own separate product page.   Specifications – Outside diameter to suit (Head recess I.D): 49mm – Inside diameter to suit (Camshaft journal / nose O.D): 35mm