International Cylinder Kit, 3228771R91

Dominator, enhanced compression ratio piston
These Dominator cylinder kits have an slightly increased compression ratio that was designed to help your engine start easier as well as idle and run smoother. No additional tuning is required when installing these parts.
These cylinder kits contain both early and late style liner o-rings. Below you can determine which o-ring you will need to use for your application:
Liner O-Ring Information 685, 695 uses 3228348R1 (yellow dots .187" thick) 684 to engine serial number D475,097 (early model) uses 3228344R1 (red dots .195" thick) 684 from engine serial number D475.097 (late model) uses 3228348R1 (yellow dots .187" thick) 544, 574, 664, 674 to engine serial number 103,204 uses 3228344R1 (red dots .195" thick) 544, 574, 664, 674 from engine serial number 103,204 uses 3228348R1 (yellow dots .187" thick)
If your application is not listed or you are unsure on which o-ring to use, default to using the thicker red dot o-ring.
Dominator Piston Information: Bore Diameter: 3.875" Piston Length: 4.013" Piston Pin Diameter: 1.4173" Compression Distance: 2.635" Compression Ring Groove 1: 1-1/8" Oil Ring Groove Width 1: 1/4"
replaces 3228771R91