Custom head stud for the EZ30R and EZ36 6 cylinder engines. Special design features unique block side seating of the stud (12mm thread), polished ARP 2000 material, Allen cap for easy installation. Larger diameter than the stock head bolts for additional clamping force. A must for any turbo application. Kit includes 16 studs, 16 12 point nuts, and 16 heat treated washers.
EZ30R cases are designated by the Z30 casting found on the top of the case halves
Does not fit the EZ30D motor with 10mm block side thread. This block is designated by the J30 casting found on the top of the case halves.