[NeighborsComplaint]

You probably just scraped the edge of a bearing as you pulled the camshaft forward and it dropped. If you were yanking on it and letting it rattle around unsupported, you probably scraped the edge of one or more bearings. If you can run your finger around the edge of each bearing, feel for any rough edges and also for deep scratches on the actual bearing surfaces.

Lightly scotchbrite the edges of any deep scrapes on the bearing surfaces … do not try to polish them out completely. You just want to dress down the high spots of any displaced bearing material to prevent a "tight bearing". If you mangled the edge of a bearing, you can lightly chamfer the edge of the bearing material but there is no thrust surface, the cam just rides inside the bearing.

Short of pulling the engine and having new bearings installed, there isn't much you can do. A light burnish with a scotchbrite pad will smooth that out. If you can't Just clean the bearings well and oil them before you reinstall. If a deep scrape runs continuously front to back on a bearing or across an oil hole from the edge, a loss of oil pressure can occur depending on how badly scored the bearing is. That said, there is a lot of bearing surface relative to the load and there are a lot of cam swaps that run for tens of thousands of miles with a scrape or two on the cam bearings.