Socket Size(s) 12mm 12pt, 4mm Allen
ARP Pro Series cylinder head studs are cold-forged to ensure molecular integrity.
They're heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.
4AGZE Blue Top / Big Port andÂ Red Top / Small Port