DHD Dualoy 20 Over Delipped Duramax Piston Set 2001-2016 6.6L

This delipped Duramax piston set from DHD is an excellent alternative to OE replacements. Our delipped piston sets utilize a UEM Dualoy piston with high strength steel top ring carrier. Each piston is CNC delipped and comes with wrist pin, c-clips and rings.

For years DHD has been delipping LB7 pistons as a cost effective and safe way to increase the durability of OE castings. Removing the thin overhang within the bowl of the piston eliminates the shelf where most piston cracks begin. The success of this alteration can be seen in our Budget Hooker engines. 

In addition to the delipping process, each piston face has had .005" milled off to correct piston protrusion on blocks with deck machining. Making these corrections on the piston face typically allows for use of grade C gaskets. Always measure piston protrusion before selecting a head gasket.

Features:

• (4.075") .020" Overbore, OE LB7 Duplicate
• CNC Delipped Bowl
• .005" Decreased Compression Height (Piston Face Milled)
• Cast in Factory Cooling Oil Gallies
• C-Clip Style Wrist Pin Retention
• PVD Coated Rings
• High Strength Steel Top Ring Groove
• No Wrist Pin Bearings Included

Advanced Info:

• These pistons will clear all generation crankshaft counterweight (LB7, LLY, LBZ, LMM, LML)
• Due to delipping; Installation of these pistons will require professional rotating assembly balancing
• Pistons Cast in India (332 Aluminum Alloy) and Machined in USA
• PVD Coated Rings are Made in USA (Hastings)
• Instruction Guide

Interchange #'s

GM 97303755 (Stock Bore)

224-3452WR.020