This photo shows the relative difference in the length of Dodge (top), DeSoto (center) and Chrysler (bottom) camshafts.
This is a roller cam for the early 331 Hemi. Note the seemingly huge duration of the lobes.
This cast roller has a nearly fully machined surface. The casting is evident at the end of the shaft between the gear and the bearing journal. Although a billet cam will not have any evidence of a parting line this cam could be mistaken for a billet if the machining work had continued.
The end of a cast cam may exibit a more coarse pattern of tooling marks than a billet cam would have.
This photo shows the minor difference between the 354 cam (on right) and a 392 cam. Note the small ‘dimple’ on the end of the 392 shaft. This is typical of all factory 392 camshafts.
This is a photo of two Marine camshafts. There are several differences in the camshafts designs: different drive design, as determined by the specific installation; the bottom camshaft is a reverse rotation camshaft (compare the position of the cam lobes in relation to the keyway); the bottom camshaft uses a beveled washer, similar to that used in 56-58 engines, but of different dimensions (photo below). The cam on the top has the shoulder machined as part of the shaft.
The washer on the left is for the reverse rotation cam pictured above, on the right is a typical washer for the 56-58 camshafts.