Bought my first airplane in May. 1970 172L w/ 8000+ TT and 1700 SMOH. Took it in for my first annual yesterday. Two bad cylinders, pitted tappets and cam lobes. Shop says I need a new motor (overhaul). I can't say I'm shocked, I did buy a high time airplane. Just wasn't expecting it this fast! Well, I guess a $30k annual is a good way to get accustomed to aircraft maintenance costs! On a side note, they can put high compression pistons in and do the 160 HP STC for <$1000.00 Has anyone done that, is it worth the extra 10 HP?