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17-24 GM 6.6L L5P Duramax UEM Stock Dualoy Piston Set (40 Over Bore)

Contact us to confirm availability if you are in a hurry. 

The race to produce a dependable oversize replacement piston for the L5P engine platform is over! The availability of these pistons opens the door for L5P engine rebuilding and customization. These OE style replacement pistons have the same bowl and compression ratio as stock. 


  • (4.095") .040" Overbore,
  • Stock OE L5P Duplicate Bowl & Face
  • 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:

  • Professional rotating assembly balancing recommended
  • Pistons Cast in India (332 Aluminum Alloy) and Machined in USA
  • PVD Coated Rings are Made in USA (Hastings)
  • Instruction Guide

Part number: 7227DKP.1.MM-Z

Interchange #'s

GM 12686800 (Stock Bore)


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