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You guys are funny not wanting to buy a used cam. I wish you guys were with me when I toured Crane Cams in Florida years ago. Lesson of a life-time. 
This Ultradyne 640 cam supposedly came out of running low 10 second motor, he said he switched to a roller cam setup and didn't need this one anymore. I liked the idea of it being broke in already and having the matching lifters. Too many new cam failure stories these days.
Unless its a roller cam even if the lifters are matched there are no guarantees of a cam not wiping out when going to a different block. Ask Dan (performance only) how each block is different in its own way. 
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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