6-2 @ 210lbs. Only aeroplane i've ever sat in to that gave me a nope is the KR-2.
Smallest aircraft i've flown is the BD-5G which was surprisingly comfortable !
All the usual stuff has been fine, Cessna 100/200/300 series, PA28, 34 etc... RV6/7 can be a bit tight with 2 good size guys in...