So, for lack of funds, I'll be heading down to the junk yards to check out some 12As. Some ran when they were taken out, some are still in cars. I have a couple ideas as to what to look for/listen for, but what are some good tips from the pros? I know to listen for a good "puff puff" out of the spark plug holes, but what are some good or bad signs to look for? A fiber optic camera would be pretty cool right now.