Well, Got both heads off tonight and found the problem. I had no compression on #3 cylinder is the reason for the teardown.
Found bent exhaust valve on #3. Also found a bent exhaust valve on #2. Looks like both exhaust valves on #2 & #3 have been making contact. This is the head I removed to get my center mount powdercoated so I started thinking it was something I did.
Then I pulled the Left head off and found that #6 had both exhaust valves making slight contact. The way it was explained to me was that the cylinders furthest from the driven end of the cam are most likely to have this happen to them because as revs increase, that end of the cam (due to drag and twist) becomes slightly retarded from where it should be and is now lagging as the piston comes up on the exhaust stroke. WHAMMOOO! Contact.
Maybe this is something everyone running hybrids w/ 3L valves might want to keep an eye on.
I'll be getting the valve reliefs in the pistons opened up (dished out) a little deeper in to hopefully avoid this in th future. Now all I have to do is order up some new valves and what not.
