I've send the cam to the machineshop last week for regrinding it to the Holbay specs. I noticed one of the camlobes is badly worn, as is clearly shown in the picture. Only one, the others are fine. How is that possible...
First thing Henk, have you removed all the rocker arms and kept them in order so you know exactly which position they came from? Have you checked that all the exhaust rocker arms are the ones with oil holes on the underside as this lubricates the system on that side? The inlet rocker arms don't, or should not, have an oil hole on their underside. They have oil fed from the rocker shaft internally. Having both sides correct is
very important. Over 90% of all the engines I have stripped, with cam wear on various lobes, have been previously rebuilt by someone who did not keep them in the correct place and there were arms with oil holes on the inlet side and some without on the exhaust side!
With that amount of wear even on only one lobe and rocker arm - and that rocker arm will be bad and should be replaced too as I doubt it can be refurbished, but if they do manage, it will certainly need the case hardening to be redone. I have seen this so many times and it shows how many people overhauling engines don't really know how! Also with that amount of wear, all the material that has come off will have circulated with the oil and you need to check everything for wear now. Particularly the oil pump, and all bearings on the crankshaft, as well as totally cleaning out the oil system to get rid of the abrasive oil and metal swarf mix.
As JL has already said, I would be surprised if they can recover that cam because of the amount of wear on that one lobe, but if they have rebuilt it up and reground it, they must have also redone the case hardening. Make sure they have done that to all the lobes. But you must
not rebuild this now without refurbishing all the rocker arm pads. You do not use worn rocker arms against a newly reground cam, because it will not last if you do. I know at least two owners that did that and the cams were shot in less than 10,000 km.
Roy