The change of tappets were to increase camshaft life . The package used a solid tappet with hardened bottom (or disc on bottom from v 8 engines) which is why the shorter push rod. Original tappet is hollow and does carry a lot of oil in it. The wide gap ring allowed more blow by and that is why they went to the top breather. Of course this change also led to more camshaft problems as the oil mist over camshaft was reduced with top breather. The very latest was a larger side breather but I never saw one of them installed on an engine.
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