TA head bolts offer the ultimate in quality and the convenience of bolts for your big block Buick. Allows you to re-torque your cylinder heads without removing the rocker arms or valve springs because of our reduced 9/16" hex head diameter (1/2" on small block and Nailhead). TA head bolts are cold-formed from 8740 chrome moly steel for strength and head treated prior to thread rolling and machining. Kits include the bolts with hardened and parallel ground washers to ensure even loading and accurate torque readings.