Description

The Cummins Piston 3923163 (Standard Size) —commonly identified by the “3163” piston crown marking —is an OEM-spec piston assembly designed for 6CT 8.3 diesel engines . Manufactured to factory tolerances, this piston delivers precise fitment, stable compression, and long-term durability in Cummins engines . Piston crown markings are critical during engine assembly to ensure the correct piston type is installed for the specific engine configuration. The “3163” marking corresponds to piston part number 3923163 , which is widely used in 6CT 8.3 overhaul kits . Correct piston identification helps maintain proper compression ratio, combustion geometry, and emissions performance. This piston features precision-machined ring lands, controlled thermal expansion characteristics, and an optimized skirt profile to reduce friction and maintain piston stability under load. When paired with the correct piston rings, pin, bushings, and retainers, it helps restore factory performance, control oil consumption, and reduce blow-by. The 3923163 piston is commonly installed during 6CT 8.3 engine rebuilds, in-frame overhauls, and professional remanufacturing projects . It is trusted by diesel technicians and engine builders who require OEM-level reliability and correct piston identification. Identification & Fitment Notes Part Number: 3923163 Crown Marking: “3163” Engine Platform: Cummins 6CT 8.3 Size: Standard (STD) Use Case: Included in 6CT 8.3 piston/overhaul kits (verify marking during assembly)