Description
This is MAHLE Motorsport's cast performance piston set for the 6.6L Duramax L5P, built for the loads of a highly boosted direct-injected engine. Each piston has a de-lipped performance bowl, a steel top ring land and an oil cooling gallery.
Fits: GM 6.6L Duramax L5P only. MAHLE lists a separate kit (930213055) with the 2024+ bowl design for 2024 and newer L5P engines.
Specs
- Bore: 4.055 in (standard)
- Compression Height: 2.122 in (0.010 in shorter than stock)
- Stroke / Rod: 3.898 in / 6.417 in
- Pin Diameter: 1.417 in (36 mm), floating, steel
- Crown Volume: -40.6cc dish, no valve reliefs
- Compression Ratio: 16.0:1 (MAHLE calculation)
- Piston Weight: 925 g each
- Material: Cast M174+ aluminum
- Coatings: GRAFAL coated skirt
- Ring Set: 3.0 mm steel keystone top / 2.0 mm second / 3.0 mm oil
- Piston-to-Wall Clearance: 0.0016-0.0023 in
What's included: 8 pistons, heavy-duty wrist pins, snap ring locks and ring set (40xxMDK-D).
Oversize versions are 197987875 (4.075 in) and 197987895 (4.095 in). The CR figure assumes 0.013 in protrusion above deck and a 0.051 in head gasket. Have your machine shop confirm bore size and clearances before ordering. Questions? Call Ducky at 479-799-3953.
