I've got a 84 Z28 with a rebuilt(new) 350 in it. The engine only has about 100 miles on it. When I start the car, there is a squeaking & clanking noise down in the flywheel area. No, it's not a bearing, I went under the car with a stethascope and tried to isolater the problem, but no luck. I cheaked the torque converter bolts - all tight, I know the flywheel bolts are tight, the person that built me engine & myself torqued them down. If you look at the flywheel/TC assembly when it's running with the cover off it looks like it is wobbling, like its out of balance or something. The reciprocating assy in the engine was balanced. When I put the car in gear, the noise stops until I start moving. This thing has got me confused. I'd appreciate any help you could give my. Thanks alot!