My 26 Shamrock has served me well, not saying they are perfect. Tough boat and sips fuel with the cummins! To the fella that talked about 26 Shamrocks with twin engines. Bull crap. The 26 hull has always been a single engine keeled hull boat!!!
One offs happen. Years ago (like 10 years ago when the 26 just came out) I was offered a hush hush twin jackshaft I/O cummins 26 Steiger. They teamed up with cummins and it was a test boat.
Heres an odd one, atleast to me, down on the south shore of Long Island we have a 29 dyer with twin yanmars. I've never seen one with twins.