John, do you have a small magnet that you drag thru the old
oil if you still have it to check, as long as the container was clean it might help your check.
If you remove all the rockers and check at each pushrod for equal camlift with a mag based dial gauge the dud cam lobe's if any should be obvious.( If your cam is a dual pattern the ex lobes may differ from intakes, but exh/exh & int/int should all be the same within about 0.005". If you have enough to make a noise it will be much more.