I fit the cam into the block, but it binds in one spot while rotating. should I scotch brite the bearing til it rotates freely or is it no big deal and leave alone?

I can still rotate cam, just snug in one spot.

Sometimes I take a bearing knife and cut the shiny spot off until it turns free and sometimes I just run it. I've never had a bad experience, and some of them I thought were way too tight.

OK, sounds like no big deal. Thanks

If you know where the spot is... clearance it..
it should spin freely with just using your hand
and spin a few turns

Yes, when I pulled the cam out I did find marks on the upper part of front and rear cam bearing only. I can scotch Brite them. It's all I have for dressing bearings

Make yourself a reamer by making diagonal hacksaw cuts in each bearing journal of an old cam.

I have one of these sizer cams but its for a SB.. nothing
for a B or RB

OK. That's interesting. Why can't I just use a scotch Brite pad and rub out the wear spots? Shouldn't take much.

It will take a while with the Scotch Brite.DAMHIK...

Not rubbing bad. Never had the issue before. The shop was suppose to fit the cam. Guess they didn't.

because scotchbrite is an abrasive and will leave minute particles of that abrasive in the bearing surface also you will need to wash the block out again if you haven't already done so,,a bearing knife is the proper way.

Ok

It sounds like you have bent cam to me, especially if it is a Mopar brand cam Set that rascal up in a set of V blocks with dail indicator and see if it is bent

That's what I first thought, but I remembered moparts usually have cam alignment issues with the
bearings. It is a comp solid flat tappet that has been nitrated.

Check it first and go from there Let us know if it is warped or bent

ok

Scrape the bearing with a single edged razor blade. You only need to take off a little and the shiny spots will show you where. Or you could blue all the bearings, install the cam, rotate it a couple of times and see that way. It's possible that when you get the first areas scraped, there will be contact somewhere else.

Keep the razor blade about perpendicular to the surface.

Scotchbrite has those particles, but it also isn't very precise and that's what I worry about.

R

ok, I checked the cam for straightness. looks like .0005-.001 out. I scraped the bearings with a sharp pocket knife and blended with scotch brite pad. spins good now without binding, but is a snug fit.

I thought it had to be bent some to not rotate freely. I have heard of some people straightening them with a hammer and a dull chisel, NOT ME though You should be good, I have had to scrape more than one new cam bearing due to Mopars poor machining of the cam tunnel not getting one or more of them not the proper I.D. One of the better machine shops I use to use in SO CA would use a small cylinder hone to enlarge them