Help ID Piston

[TBuck2003]

Guys,
Need help on a piston part # Stamped Up Port 495 then below 353.Sorry do not have any more info till I yank it apart.Thx.

Todd

[Jay Smith]

Todd,
It should be a Weisco ( Mercury High Performance 2.5 ) the vintage is 1995-96 ish ( don't quote me on the exact dates ) and called low ring model as the top ring lan posistion is .050" lower than the eariler high ring issued ones. The reasoning behind the movement down was to locate more absorbing heat sink metal at the crown and above the lan to try to prevent expantion rate issues causing locator pin failures.. Guess what it didn't work.LOL These were superseded to the 280 style ( with two lightening holes instead of the slots yours have , same lan locations though) Then later upgraded to the top pinned models...

Good luck,

[TBuck2003]

Jay,
Thanx your explanation was exactly what I was looking for.It is nice to have the knowledge on this board.Much appreciated.


Todd