Robin described to us the exhaustive process OMC went through, starting with a clean sheet of paper and redesigning the entire block, as well as exhaust ports, the cooling system - the works. This block bears little internal resemblance to its predecessors. For example, it features new load-balanced pistons with a solid skirt design for added strength. Gone are the intake-port openings, and OMC also lowered the wrist pin by half an inch to reduce loading on ring land. The connecting rod was therefore shortened, and beefed up with larger rod screws and a thicker joint surface. It has a retained wrist pin bearing, whereas the older engine had loose needle bearings. All this adds up to longer bearing life and increased durability.