DHD Duramax 4140 Steel Billet Main Cap Set 2001-2016

Converting your Duramax engine build to billet main caps will increase block rigidity and tensional stiffness. OEM main caps tend to collapse in on themselves when subjected to high horsepower. As the cap collapses, the dimension across the parting line becomes smaller, eventually causing the edge of the bearing to begin scraping oil off the crankshaft, leading to bearing and crank failure. Engine builds with power levels north of 800hp should always receive billet mains.

Features:

• Drilled & Tapped for Easy Removal
• Precision Machined from 4140 Steel
• Rear Cap Machined for 360 Degree 4 Bearing Thrust

Hint: Be sure to order an extra set of thrust bearings to take advantage of this feature. A normal thrust kit only contains 3 bearings.

**** Block Will Require Main Cap Align Bore & Hone ****

These caps work great when paired with DHD Torq Series Chromoly Main Studs.

• DHD 800-038 2001-2005 LB7 LLY Duramax 6.6L
• DHD 800-039 2006-2016 LBZ LMM LML Duramax 6.6L