Kit #3 – Triangular reduced shank 3/8″ x 16 tpi into head chromoly studs for STOCK HEADS WITH MANEY ALUM CYLINDERS. SS spring washers. Requires 3/8″ x .620″ x 16 thread Time-Serts in head.
High strength ARP. The triangular shape allows a reduced shank while still locating the head on the cylinders. 12 pt nuts and Belleville spring washers included. See TimeSert installation