If you havn't already thought about it, hardened valve seats. Running unleaded can cause valve seat recession in older vehicles. Generally, ones that ran for an extended period on leaded before the change are apparently relatively safe, but exposing new metal may open up a new problem.
Anyone out there agree/disagree? Please chime in, I'm only repeating what I have read.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
| 
