Out west, we recommend Tony Athens’ Sea- ûboard Marine. Here, he’s dropping a 315-hp ûYanmar 6LPA-STP in a 1988 Shamrock (LOA: û25’9”), which Athens now calls the “Sham- ûrocket” because of its increased speed.

Powerboat Reports recommends products. We’re going to switch gears a little here, though, and recommend people—diesel mechanics and diesel repowering businesses. Our sources tell us that these 10 franchises are reliable, experienced and do quality work.

We tried to find at least one standout from each area of the country. Our list serves as a starting point for those who want to upgrade their current diesel engine(s) or jump from gas to diesel. Like personal computers, diesel engines are improving rapidly. They’re getting lighter, cleaner, smaller and more powerful. …