Id'ing hardened 103 cam from older cam?

[Sopicki]

Hi all,
I've got an '87 300e with the original soft (worn to nubbs) camshaft. MB and the parts suppliers only sell the later, harder camshaft. This cam also requires different rocker arms.

I just purchased a cam and rockers from a used parts supplier and what showed up appears exactly as my old cam down to the 22 stamped on the sprocket flange. If I understand correctly the hardened cam should have the numbers 49, 50, 56 or a 57 stamped on the sprocket flange and the rockers should have a "noticible" pad welded to the face that rides on the cam.

Can anyone confirm or deny my info???

Thanks!

Bob Kopicki
'87 300e
'85 XJ-6
'76 GMC C-15
'67 TR-4