PDI Big Boss™ Cryo‑Treated Cummins ISX/X15 Head Bolt Kit

Available for: Cummins ISX and X15 Engines Key Benefits Maximum clamping force  Superior fatigue resistance Thermal Stability Corrosion Protection Ready-to-Install Kit Warranty: 1 Year Unlimited Mile Warranty Upgrade cylinder‑head integrity and lock in long‑term performance with PDI’s premium cryogenic‑treated head bolt kit. Engineered for heavy‑duty powerhouses that run harder and longer, every bolt is precision‑machined, deep‑frozen to –300 °F, and slowly tempered back to room temperature—relieving internal stresses and creating a denser, more uniform grain structure. The result? Rock‑solid clamp load you can trust, mile after mile.