Cam gone flat? Here's a interesting video.

While on the subject, I think it’s worth mentioning that the big GMC industrial truck V6 gasoline engines had a well or wells in the valley between the cam and crank that stayed full of engine oil. I don’t know if there was a constant pressure supply to this area or if it was just oil that came from the top end on its return path, but the overflow point was above the lifters. All in a relatively low rpm heavy duty engine built in the pre-EPA Detroit Iron Age. It makes me think that running a spray bar through the valley with a hole drilled above each cam lobe plumbed to an oil gallery wouldn’t be a bad thing to have if it could be done without causing oil supply issues elsewhere. My machinist says that some of his most frequent customers have flat tappet cam hot rods they like to take through parades or rod runs. Too much idle time without enough splash.