165/470 Mercruiser with pistons rusted in place

[Joe Mc]

Hello,<br /><br />This engine had antifreeze in all 4 cylinders and now the pistons appear to be rusted in place.<br />I inherited this boat so the details are a little fuzzy, the boat probable sat for 2 to 3 years with the antifreeze in the cylinders. Can this block be bored? If so how much? From reading the post on this site I have learned that this engine has the Ford 460 head, but what about the pistons? Can I use automotive pistons and rings?<br /><br />Thank you for your help,<br /><br />Joe

 

[Walt T]

Re: 165/470 Mercruiser with pistons rusted in place

It's most likely junk.

 

[kcole683]

Re: 165/470 Mercruiser with pistons rusted in place

The4 3.7 liter 4 cylinder engine is an aluminum block with cast iron head. There are oversized pistons available (.oo5 and .030 oversized).<br /><br />This engine has alot of quirks and is expensive to build.<br /><br />Go to: 470 merc.forum <br />That is a 3.7 liter mercruiser forum you can get alot of info there.<br /><br />I own a 1985 170 3.7 I don't think I would spend alot of time on the engine you have. Not really worth the effort at least not to me.