Hi there,

I need a definitive answer to this question: I need a new set of piston
rings for a mercruiser 2.5L 120 engine and would like to find an
alternative set of rings to the genuine parts. I am led to believe that
this engine is a derivitive of a Chev or GM unit. The block has GM
stamped on it and the engine serial number is: 2773308.

Can anyone stick their neck out, based on cast iron experience and tell
me what other piston rings would fit this engine?

cheers

Terry

The 2.5 Mercruiser engine is based on a Chevy II or Chevy Nova auto
engine from the early 1960's. The engine displacement was 153 ci which
is 2.5L. A later version was called the Iron Duke, used for some small
GM cars ln the 80's + - . The 3.0 ltr (183ci) version was marine /
industrial only. Same basic engine with a larger bore .