roller camshaft bearings

I found this in the FRPP catalog. Anybody used these? What cam did you have to use? The description mentions the metal (SAE 8620) but none of the cam descriptions mention the metal the cam is made from.

-------------------excerpt from 2005 FRPP catalog----------------
Camshaft (Roller) Bearings
NOTE: The 351 cam journals are NOT production
dimensions. The 429-460 dimensions are
production. These roller bearings require
an SAE 8620 steel camshaft.

PART NUMBER APPLICATION
M-6261-C351 302/351W
M-6261-A460 429/460 Wedge
M-6261-D351 351 Ford

Rick 91GT said:

Roller Bearing Cams are for race motors, they take the load from a very heavy spring much better then the convential billet core.

Click to expand...

Thanks for the info.