I bought a 1934 street rod. While driving I have a vibration. This is what I have done so far balanced drive shaft, changed flywheel, checked wheel bearings, checked rear, rblt trans,rblt engine. The only thing I have noticed is that they used old style motor mounts( the flat style with a donut rubber). They are bolted straight through with a bolt. The bolt is torque as tight has they could get it. It looks as though the rubber is doing nothing. The motor can't move. Should I loosen the bolts a little?Could this be causing the vibration? Thanks your help would be greatly appreciated.