I had to purchase some new rockers for my 500efi and ended up buying the original Crane gold rockers. A few of the factory rockers have the corners removed for valve cover clearance. What's the best way to clearance my new rockers? Can I just use a vertical belt sander or will the heat affect the alloy? Should I spend the time to remove it in the mill? Or am I just over thinking this? I wasn't sure if there was a heat treating or temper I needed to preserve.

The NEW style Cranes Golds should clear. If they are the older style, then I see no reason a belt sander wouldn't work. I would just tape off around the bearings so no metal flakes can make their way in. It really shouldn't get that hot.

The belt sander works great. That's how I do it. As Griff said, I cover the rest of the rocker with tape to keep the metal out of the bearings.
Eddie

i had the same problem a few years ago.i bought a set of harland/sharp rockers.a few would not clear the aftermarket valve covers.i marked the arms that would not clear and removedthem off motor and set in vise a nd used a die grinder w/a stone and took care the clearance problem.

Do it slowly and keep it cool. I sanded one fast and I did not think it was all that hot. BUT it was hot enough to crack the tip that holds the pin and roller bearing in. I was shocked and glad that I caught it. I will try to post a pic.