This 10-phase procedure uses the LS-8705 insert to repair stripped bolt holes on Cummins 855 / NH / Big Cam engine blocks—restores strong, reliable threads for head bolts and liner applications. Introduction: Reliable Bolt Hole Repair for Cummins 855 Engines The LS-8705 provides deep, full-strength repair—critical for maintaining head torque, gasket sealing, and engine integrity. Phase 1-3: Preparation & Damaged Hole Assessment Secure engine block – Fixture or stand support Remove head / components – Full access to damaged hole Inspect & measure threads – Confirm stripping & depth needed Phase 4-6: Hole Preparation & Insert Installation Drill & tap to 13/16"-16 – Clean, straight, full depth (use kit reamer/tap) Apply high-strength thread locker – On external threads of insert Install LS-8705 insert – Torque to spec with proper tool Phase 7-10: Finishing & Verification CRITICAL: LS-8705 Insert Protocol Trim excess insert if needed – Flush to deck surface Chase internal 11/16"-16 threads – Clean & true for bolt fit Reassemble head / components – Torque sequence to Cummins spec Pressure test & run engine – Verify no leaks or issues Critical Warnings: Thread Insert Installation Hazards AVOID THESE CATASTROPHIC MISTAKES: ❌ Misaligned tap/drill – Crooked insert & bolt bind ❌ Shallow tap depth – Weak thread hold ❌ No thread locker – Insert loosening under load ❌ Over-torque insert – Block cracking risk ❌ Skip internal thread chase — Bolt seizure Why LS-8705 Beats Alternative Repair Methods Alternative Risks: ❌ Heli-coil → Limited strength & failure risk ❌ Oversize bolt → Misalignment & uneven torque ❌ Block replacement → $10K–$22K cost LS-8705 Advantages: ✅ Deep 3.25" engagement ✅ Accepts standard 11/16"-16 bolts ✅ Full-strength repair ✅ Saves block & thousands ✅ Bulk pricing to $32.48 ✅ Proven Cummins 855 solution Repair Cummins 855 Head Bolt Holes Professionally. OEM-Strength. Save Blocks. Boost Rebuild Profits. Get LS-8705 – $56.00