The LS-8705 (ATC-8705) thread insert restores stripped or damaged head bolt holes in Cummins 855, NH, and Big Cam engine blocks—11/16"-16 internal × 13/16"-16 external threads, 3.25" length—delivers deep, strong repair for head bolts without block replacement or extensive machining.

The Massive Costs of Ignoring Stripped Head Bolt Holes in Cummins 855 / Big Cam

Stripped head bolt threads force expensive fixes: oversized bolts (risky), heli-coil attempts (often fail), deck machining, or complete block replacement—leading to head lift, gasket blowouts, or full engine downtime.

• Heli-coil / chase failure – $600–$2,500 rework
• Head gasket / alignment failure – $2,000–$6,000 repeat service
• Cylinder head & liner work – $3,000–$9,000 labor & parts
• Engine block replacement – $10,000–$22,000+ short/long block
• Downtime revenue loss – 10–40 days ($800–$3,000/day fleet loss)
• Rework & warranty claims — Extra 40–120 hours at $150–$350/hr

What is the LS-8705 Thread Insert?

The LS-8705 / ATC-8705 Cummins 855 / NH / Big Cam Bolt Hole Thread Insert is a high-strength repair insert with 11/16"-16 internal threads and 13/16"-16 external threads, 3.25" overall length—engineered to salvage stripped head bolt holes in Cummins 855, NH, and Big Cam engine blocks.

Perfect for diesel rebuilders, Cummins specialists, and fleet shops, it provides deep engagement, accepts standard bolts, and works with Apex/Monaco/Porta-Tool thread kits—saving blocks from scrap and turning potential $10K–$22K losses into profitable repairs.

Complete Insert Specifications & Cummins Compatibility

Professional Features & Engine Block Benefits

Economic Impact: LS-8705 ROI for Rebuild Shops

Scenario	Cost Impact
LS-8705 insert repair	$56.00 (single) – $32.48 (bulk)
Heli-coil / chase failure	$600–$2,500
Head & liner rework	$3,000–$9,000
Engine block replacement	$10,000–$22,000
Total stripped hole cost	$13,600–$33,500 per engine
LS-8705 ROI (first repair)	243–598X return on investment

When Cummins 855 / Big Cam Techs Choose LS-8705

• Cummins 855 / NH / Big Cam stripped head bolt holes
• 855 Big Cam liner bolt thread repair
• Cummins engine block salvage & overhaul
• Heavy-duty diesel rebuild facilities
• Fleet maintenance on 855-powered trucks
• Head gasket & top-end rebuild jobs
• Cost-effective thread restoration

Why Cummins Rebuilders Trust LS-8705

Cummins 855 / Big Cam specialists rely on the LS-8705 for its deep 3.25" engagement, precise dual-thread design, and ability to salvage blocks that would otherwise cost $13K–$34K to replace. It restores factory-level strength and keeps engines profitable.

From long-haul rebuilds to fleet shops, this insert turns damaged blocks into high-margin repairs.

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