I once snapped a crank in my daily driver, an old mini. At that time you could get an exchange crank for half the price of a new one, but the old one had to be in fair condition and one piece. So I went to the dump and found an up ended mini engine, for some reason the sump was off and the endcaps on the mains and big ends were off. All I had to do was lift it out, the bearings were red rusty but it would do for the exchange. Paid £5, took it home and then thought "Better clean it up!" Having done that it didn't look too bad so mic'd it up and it was OK, certainly within spec. Reassembled the engine and the car ran another 5 years and it wasn't the crank that did for it in the end, side swiped on a roundabout.
Doug