This 10-phase procedure uses the ATC-8799 / LS-8799 insert to repair stripped head bolt holes on Cummins ISX / ISX15 engines—restores strong M16 × 2.00 threads with fixture alignment for proper head reinstallation. Introduction: Permanent Head Bolt Hole Repair for Cummins ISX The ATC-8799 / LS-8799 insert with fixture alignment ensures perfect thread axis and clamping force—critical for preventing head lift and gasket failure. Phase 1-3: Preparation & Damaged Hole Assessment Secure engine block – Fixture or stand support Remove cylinder head & components – Full access to stripped holes Inspect & measure threads – Confirm stripping extent & depth Phase 4-6: Hole Preparation & Insert Installation Install M20111-A / M20111-C alignment fixture – Maintain precise axis Ream & tap to 13/16"-16 – Clean, straight, full depth Apply thread locker & install ATC-8799 insert – Torque to spec Phase 7-10: Finishing & Verification CRITICAL: ATC-8799 / LS-8799 Insert Protocol Trim excess insert if required – Flush to deck surface Chase M16 × 2.00 internal threads – Clean & true for bolt fit Reinstall cylinder head – Follow Cummins torque sequence Pressure test & run engine – Verify no leaks or issues Critical Warnings: Head Bolt Insert Installation Hazards AVOID THESE CATASTROPHIC MISTAKES: ❌ No alignment fixture – Crooked insert & head misalignment ❌ Shallow tap depth – Weak clamping force ❌ No thread locker – Insert backing out under load ❌ Over-torque insert – Block cracking risk ❌ Skip internal thread chase — Bolt seizure & torque loss Why ATC-8799 / LS-8799 Beats Alternative Repair Methods Alternative Risks: ❌ Heli-coil → Insufficient strength & failure risk ❌ Oversize bolt → Uneven clamping & misalignment ❌ Block replacement → $14K–$28K cost ATC-8799 Advantages: ✅ Deep 2.50" engagement ✅ Accepts standard M16 × 2.00 bolts ✅ Fixture-compatible precision ✅ Saves block & thousands ✅ Bulk pricing to $32.48 ✅ Proven ISX solution Repair Cummins ISX Head Bolt Holes Permanently. Strong Clamping. Save Blocks. Boost Rebuild Profits. Get ATC-8799 – $56.00