I was giving a slightly used cam that I think is a Comp Cam. The only info I have for identifying this cam is some lettering in the cam spocket end of the cam that says the following; C6F S. I was told it has a 620 lift, and that's all I know. Any help in identifying this cam further would be greatly appreciated..Paul. Also I know it is a solid lifter roller cam. I have the solid lifters' with it. Thanks.