ARP Head Studs Mitsubishi Mitsubishi EVO Eclipse 4G63 7 Bolt 1993-2006 | 207-4203 Vehicle Make_Nissan DB Series Blue Wideband AFR

DB Series Blue Wideband AFR Gauge

) In addition the block must be machined

All Borla systems are backed by a million mile warranty

565" Knurl / 12mm x 1

ARP Head Studs Mitsubishi Mitsubishi EVO Eclipse 4G63 7 Bolt 1993-2006 | 207-4203 Vehicle Make_Nissan DB Series Blue Wideband AFRARP 4G63T head studs feature an undercut design with 12 point nuts for optimal sealing and torque. Each ARP stud is made from 8740 alloy, rated higher than aircraft quality, and heat treated to 200,000psi. These studs are then centerless ground for perfect concentric design followed by thread rolling. In addition, ARP studs are undercut, which equalizes the stretch on the stud, making for more consistent clamping, and compensating for head gasket