http://www.nvengines.com/index.php?o...mart&Itemid=67

I had to smile at the advertising copy under the diesel conversion head photograph.

"High maintenance "O" rings" ?

Some of us like "O" ring sealed contra pistons. Some of us prefer traditonal lapped set ups. Most of us probably don't care. One thing though - I've never heard of "O" ring sealed contra pistons described as "high maintenance"; at least not the viton "O" ring type which has been preferred for decades.