I had excessive cam lobe wear on my Plus Eight 5 years back. It was a high lift cam (Crane 234) and so an increased wear risk over a standard cam, particularly as I keep the car off the road during winter months. When I had a new engine built by John Eales, he suggested that the wear was due to oil drain-down after winter lay-ups that was probably the issue; a cause that I had suspected.
Since installing the new engine, after winter lay-ups, I remove the spark plugs and rocker covers and run copious oil along the rockers and valve gear. The oil will drain into the engine valley and hopefully run down the lifters on to the cam lobes.
A quick spin up on the starter after the rocker covers have been reinstalled to pressurise the oil system then replace the sparkplugs and hey presto - some reassurance that one has done something to minimise the wear.
