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The marking on the crank appears to be from an old rebuild. When the crank was ground they stamped it M010 R010 meaning it was ground 10-10. If the bearings are .040 it must have been rebuilt a couple more times. Like Tim said: How bad does the knock have to get before you shut it off? It must have been pounding pretty loud. Says a lot for the old EBU rods too.
http://ford-y-block.com 20 miles east of San Diego, 20 miles north of Mexico 
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Bill; I've often thought that the Ford "Y" block was about the toughest engine around in it's day. I guess what you found in your tear down, proves it!
Paul
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Bill, I've seen a few cranks like this before and the only thing I want to know is how bad does a knock have to be to shut the thing off and fix it.  It's amazing what some people will drive. 
 God Bless.  Tim http://yblockguy.com/
350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor
tim@yblockguy.com Visalia, California Just west of the Sequoias
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Wow Bill, I remember thinking the same thing when I dissassembled my 272. All sludged up. wasted thrust bearing and cracked crankshaft but ran and performed really well! Guess they dont make them like they used to. Frank
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Wanted to share my dismantling of this 292 truck engine and proof of how tuff this y block was. It had ECG-C heads, 1 dearborn,other canadian, noticed # 5 piston had been hammering on head and when i pulled the rod cap off it had been running on the steel bearing backs and worn .050" into journal, like a mini stroker! there was no sign of heat or discolored journal and everything was oily suggesting it ran till it was removed from truck.!!! the # 1 bearing had just started to hammer out the copper backing as pictured but all the other bearings were perfect! The crank was .040 on pins and .050" on mains according to bearing shells. I,ve pulled hundreds of engines apart that were burnt blue from less wear than this!! It had ECK grooved cam that was like new, and yet had the external oil bypass into valve covers. The front crank c/weight had been stamped with maybe engine builders job # ??. Also i have pictured the offset of rocker arm tip to valve tip alignment and point out for newer members that this can be easily shimed across with washers and take the side load off the arm. This was one mean reliable strong old y block engine! regards bill.
 AussieBill YYYY Forever Y Block YYYY Down Under, Australia
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