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what is the percentage of tin and nickel for a Chevy Big Block C/N#3999290 Is they any way to look at it and tell. I know on some small block there is a stamp, is it the same way for Big Blocks?
 

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I've never seen anything like what's on the smallblocks. They definitely turn greenish if you acid vat 'em, just like the high nickel/tin blocks.
 
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