Just installed a roller cam in my 511 and using a stock chain cover. Which cam button should i use?

None or nylon. Plenty of debate.
The cam “shouldn’t” move forward

I use the Comp Cams nylon one. You'll have to carve on it a little to get the fitment correct but it works great.

Didn't know you could go without on a BB with Roller. I guess the chain would hold it from moving.

Read on another thread Keith Black never used them building engines.

Thats interesting to know. Thanks

I used Comp chain and button in mine. There is a slight witness mark on the inside of my steel cover. Birdtracker

it won't with standard flat tappet lifters
It can and will with rollers lifters

What holds the cam button in? Is it a press fit?

the button sits in the recess between the 3 bolts, it can't fall out once the cover is bolted on. Should have .005-,010 clearance.

Joe

Resistance from cam turning the oil pump drive moves cam backward

Here is a thread I was involved in.......post 59 and 60 may be of some interest....Cam buttons

I just turn oout a button out of aluminum on my lathe, that fits, seems like everyone I buy for a mopar does not fit right, or is the length is wrong. And I never tried it on a mopar, but I know for a fact that on small block chevy's and ford's if you leave out the thrust button on a roller, major engine damage does happen, fixed a couple in my time.

Yes, i used to run small blocks. They have a cam plate that limits cam movement. Big Blocks don't have that. I measured the center hole in the cam gear. It measures .736", will i need a special button to fit?

mancini has them that you can shim the button to your clearance

All of the Hemi engines they built probably had a mechanical fuel injection pump driven by the gear drive. The hub for driving the pump was bolted onto the cam gear right where you would put a cam button. Iirc there were shims between that hub and the round cover to control cam thrust. Therefore a traditional cam button was not only impossible but also unneeded. The pump drive and gear drive cover served the same purpose.
I have not had one of these apart for 45 years so I may have missed some detail but you get the drift. Injected engines would not/could not use a traditional cam button and didn't need one. Everybody else does.

I found a few things over at Hughes Engines as well. Thanks