1st photo is a 6.1 cam in a VVT block,
2nd photo is a 6.1 Cam vs a SRT392 cam or Non VVT vs VVT.

It's not just the diameter of the front journal , you still need to extend the front of the cam by about .60+/-.10

I'll try and get some photos up of the differences between the two blocks this weekend.

Pre Eagle Cam VVT Block.jpgSRT 6.1 VS SRT 392 Cam.jpg