That first 55hp had only two transfer ports, and it had odd, hat-shaped combustion pockets with swirl-grooves leading into the pockets. Later versions added a third transfer port, or great big boost port depending on your terminology, and had normal looper combustion chambers, oh and they changed from domed to flat-top pistons with longer, stronger rods. Jim Hallum, who was known to some of the bigs at OMC, and who was an OMC mechanic, got one of the second-generation powerheads and hopped it up with porting and oversized carbs and reedblocks for Gerry Walin to use in FOH, a year or so before Gerry got hurt. Among those who have built fast Evinrude triples in more recent years was Gary Hanson of Seattle, whose FRR DeSilva streamliner performed the most violent flip I ever saw, a longitudinal snap-roll that happened in an eye-blink. Amazingly, Gary was unhurt, and considered it just another dunking.