Perfect Fit Direct Replacements for EN 48383 and EN 46105 camshaft retaining tool set. Camshaft Retaining Tool Set is suitable for Cadillac, Buick, Saturn, Pontiac, Chevrolet, Saab, GMC. Fit for GM V6 High Feature Engine 2.8L, 3.0L, 3.6L, 3.6L VIN 7, 2.8L VIN 7. Engine codes: LP1, HFV6, A30XH, Z32SE, Z28NET, Z28NEL, A28NER, B284E, B284L. Lock Cams Prevent camshafts rotation during timing chain service. Help timing the engine precisely and reduce the risk of incorrect timing that could lead to engine damage. Meanwhile, both EN-48383-1 and EN-48383-3 are slotted to allow them to be installed over the SIDI drive portion of the camshaft in future applications. Built to Last .