Head Bolt Kit | 913147-3901

The ARP 147-3901 Head Bolt Kit is part of the Pro Series line, which is engineered to provide superior clamping force compared to standard factory hardware. These bolts are cold-forged and heat-treated to a tensile strength of 190,000 psi, ensuring they can handle the increased cylinder pressures of performance builds

• High Strength: Rated at 190,000 psi, which is significantly stronger than Grade 8 or OEM hardware.
• 12-Point Head Style: Features a compact 12-point head that allows for easier access and wrenching in tight engine compartments.
• Superior Integrity: Cold-forged to ensure molecular integrity and heat-treated before thread rolling to create a durable, fatigue-resistant fastener.
• Complete Kit: Comes with hardened parallel-ground washers for even load distribution and accurate torque readings.