I just helped a friend put a small comp flat tappet hydraulic cam in a 318. Everything went together great, lifters moved nice and free, used the proper oil, etc. Break in went well, we even drove it about 20 miles that evening. The next day he drove it to his dads house and didn't even make it 20 miles before enough of the lobes were gone it would no longer go. He bought a magnum core engine to freshen up and throw in, no more lifters without wheels for him lol.