ARP 123-4203 Head Stud Kit for Buick Grand National 3.8L Turbo V6

ARP's 123-4203 head stud kit delivers superior clamping force and reliability for 1986-1987 Buick Grand National turbocharged engines. Designed specifically for high-boost applications, these studs provide the critical head-to-block sealing necessary when running elevated cylinder pressures from turbochargers, high compression pistons, or other power adders.

Premium Construction and Manufacturing Process:

• Manufactured from premium 8740 chromoly alloy steel, rated superior to aircraft-grade materials
• Precision heat-treated to 200,000 psi tensile strength for exceptional clamping ability
• Centerless ground after heat-treat through ten precise cuts for near-perfect concentricity
• Thread rolled after heat-treatment for 1000% better fatigue strength compared to pre-heat-treat threading
• Specially undercut shorter studs equalize stretch distribution for consistent clamping force

Kit Includes:

• Complete head stud set for Buick 3.8L turbo V6
• 12-point nuts for positive grip and reduced stripping risk
• Compatible with T-Type models

The precision manufacturing process ensures cylinder heads and gaskets align perfectly during installation, while the optimized stud stretch characteristics compensate for head gasket compression. This engineering prevents blown head gaskets and maintains optimal sealing even under extreme boost conditions, making this kit essential for serious Grand National performance builds.