I have 56,347mi on the engine. Last week it started a quiet tapping at startup. The tapping got louder and louder and started lasting longer. It's to the point now that I can hear it all the time at idle and when I push the clutch pedal in an inch or so I can feel it. It's just like riding a skateboard on a sidewalk. I thought at first that it was piston slap but piston slap goes away this doesn't. Does anyone have any ideas?

 

I'd check the rockers..

 

OK what am i checking for?

 

just make sure they look normal with no cracked side cups or bearings missing.