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how do i tell if it is a cast crank or not?
If you look at the crankshaft "Casting line" in the photo you posted, you will see a thin line that is somewhat sharp and jagged. On a forged crank it will look like somebody took their finger and smoothed out that rough thin line (as if it was clay), making it about 3/8 to 7/16 wide. So, very thin line = cast, flat wider line = forged. You can also tell by the color and a lack of sharp crisp edges on the outer edges of the counter weights. Sharp crisp counter weights = cast, more rounded and sometimes missing some of the corner = forged. My dad owned a crankshaft grinding business for 31 years. Hope this helps, Rob 
1970 Hemi 'Cuda hard top clone
1971 Hemi 'Cuda Convertible clone
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