The garageman who is rebuilding my 383 was putting everything back together when he found he couldn't get what he thought to be the rear main bearing to go into place. Of the bearings, all are alike except one which has a chamfer or edge - this he assumed to be the rear main and that it was designed to prevent back and forth thrusting of the crankshaft. A friend who knows something of motor rebuilding told me that the one with the chamfer or edge is in fact the rear main on most Chevy engines but that on Chrysler it goes on the third or forth bearing. This seems right as a regular bearing from the package slides right on the rear main. These are all cut to -.020 to make up with the crank which has been likewise cut. The opinion of a few of you Chrysler Sages out there would be most appreciated. Thanks, Tom