I would agree with the rockers as well. You have reliefs on your pistons right? Thought that would eliminate hitting the valves except in extreme case.
90 seems low. How did the others fair?
Milky oil not good. Bad for bearings. Try cheaper oil and change every 6 months. Clean cheap oil better than a "wet tuxedo"!
Talk to the boys on fgf goggle group as they are rebuilding and troubleshooting their engines more than here.
Good luck!
No vacation in OgoPogoLand this year. My buddy's inlaws from Detriot living in the beach house now. Move this summer took up all my time.
Engine Test Stand Playlist: https://www.youtube.com/playlist?list=PLwoxyUwptUcdqEb-o2ArqyiUaHW0G_C88 restoring my 1968 Firebird 400 HO convertible (Firedawg) 1965 Pontiac Catalina Safari Wagon 389 TriPower (Catwagon) 1999 JD AWS LX Lawn tractor 17hp (my daily driver) 2006 Sequoia 2017 Murano (wife's car) 202? Electric car 203? 68 Firebird /w electric engine 2007 Bayliner 175 runabout /w 3.0L Mercuiser__________________________________________________________