No, it's not rocket science. If there are no shims to remove, your easiest option is to remove material from the rod caps, not recommended for the inexperienced. This can be done with a piece of plate glass and wet sandpaper. The other option is to rebuild the engine and replace the babbit rods with insert bearings. However, as long as you don't over-rev the engine, the 216 will run for a long time with a rod knocking.
