Pioneer Performance Main Bolt Kits are 100% U.S. Manufactured to the same hi8gh quality standards as our Performance Head Bolt Kits.

These features include heat treating to 180,000 PSI tensile strength, reduced size 12 Pt. Heads and extended thread length for distributing torque stretch which increases clamping force.

Extra thick, hi-tensile and chamfered washers are included in each kit.