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I just bought a crank from a guy online, who said it was a 312... It shows up and their are no casting numbers on it. And there is no "aspirin-sized" dot on the outer edge of the crank like you see on Tim's site about identifying the crank:
http://yblockguy.com/yblock_003.htm
Did I just buy a paper weight?
Heber City, UT (15 mins outside of Park City- basically it's in the mountains)
55 Effie
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Measure the diameter of the main bearings and post the results. The 312 had larger mains. Did it come from ebay? Pete
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Any 312 cranks I've seen had ECZ cast into the counterweight. Main journal dia. should be 2.624 at standard size. The 272-292 @ 2.498 in standard. Barry
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I have seen 312 cranks with no dot. The pics will help you identify.  292 crankshaft
 312 Crankshaft
http://ford-y-block.com 20 miles east of San Diego, 20 miles north of Mexico 
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I have 312 cranks both with and without the dot on the flange. Both have the ECZ casting clearly marked into the crank counterweights.
Larry D
Winnipeg, MB Canada Eh!
'57 Fairlane 500 Club Victoria
'58 Custom 300 Tudor
'56 Crown Victoria
'61 Starliner Z Code
'51 Ford Victoria
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It's true that not all 312s have the dot but that pic that John posted is a dead give-away. 
 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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Group: Forum Members
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The main journal does measure 2.62.... So, is the jury still out?
Heber City, UT (15 mins outside of Park City- basically it's in the mountains)
55 Effie
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grovedawg (3/25/2010)
The main journal does measure 2.62.... So, is the jury still out?That's a 312. 
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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Group: Forum Members
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THANK YOU Y BLOCK GODS!!!!
Heber City, UT (15 mins outside of Park City- basically it's in the mountains)
55 Effie
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