Engine build - Camshaft Endplay?

Yep, I know about the angle of the lobes keeping the Cam in place. I started with a bare block when building this, so all I have to go on is word of mouth, manuals, videos, and other web resources... I've never seen a cam bearing behind the cam gear. Can anyone elaborate on this? Image links, etc? Anything I've ever seen was cam gear bolting straight to cam.