This is a complete set of six (6) Pro Dual Ring Pistons for all Mercury 2.5 Liter V6 2-Stroker Outboards with Steel or Nikasil plated sleeves. Choice of Standard 3.500", plus .015, and plus .030 bore sizes.
 
Each Mercury Pro Piston Kit includes six (6) pistons, six (6) slip-fit wrist pins, twelve (12) piston rings, and twelve (12) wrist pin clips.
 
Before installing ensure your Sleeves; 1) are the correct bore and are nearly perfectly round, 2) have cross-hatching from a hone, to retain oil and lubricate for the pistons, 3) should not be glazed, which is a polished, shiny surface, and 4) should not be chipped, nicked, cut-through, or have worn spots.
 
Part Numbers
9738A10, 9738A8, 9738T10, 785-9738T10
 
Contact Mike Hill at STVracer@yahoo.com with any questions or additional needs.