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Old 10-08-2012, 03:10 PM
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Originally Posted by View Post
Can't tell because of angle/clarity of pics. Don't have my crank book with me. Looks like cast.

Rule of thumb. If the parting line on the side of the crank throw is only a line, up to 1/16" wide it is a casting. If the line is 1/4" plus and looks like it has grind marks on it. It is forged.

Stand crank on end, on a shop towel. Rap a counter weight with a hammer. If it goes "thunk" it is cast. If it rings clearly, like a bell, it is a forging.
Pics and more info fom BBC Parts Interchange Manual.
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