A friend asked if I could finish all the little details on his 55 Fairlane that were left undone when the restorer he hired had gotten burned out on the project. I gladly accepted the challenge and started finishing each task with success.The car had a fresh 292 Y block, with 100 miles on it as he had driven it down to me. The passenger exhaust manifold had a annoying leak where a tube should have been for the chock. After looking at it a bit, I though a tapered punch fit the hole perfectly , so I proceeded to cut the tip off the punch and thought I would just lightly tap it into the hole and all would be great. Unfortunately, I misjudged the hole size and the tip fell all the way into the exhaust manifold which sits above the ports. O.K., no problem, I'll just remove the exhaust manifold and retrieve the piece. But wait...., my wife calls me in for lunch. Yep, you guessed it, I came back out and stupidly forgot about the missing plug. Started the car, heard the clatter,shut it off fast, but too late of course. Crunched the #3 piston real good.,but everything else was good luckily. So the good side to the story, I was able to replace the damaged piston with engine in car, learned all about Y blocks, and have a piston to look at and always remember I'm not perfect yet. Oh, and I fixed the leak by tapping the hole and installing a small allen head bolt.