SECTION 2-D 1951 BUICK CYLINDER HEAD AND VALVE MECHANISM SERVICE 2-14 1951 BUICK VALVE LASH ADJUSTMENT NOTE: This procedure applies only on Series 40 engines used with Synchromesh transmissions; these engines have plain sleeve valve lifters. All other 1951 Buick engines have hydraulic valve lifters, indicated by a label on rocker arm cover, stating "This Engine [...]