Synthetic oils

There are at least a dozen different statements on that issue from reputable engine builders, cam companies, oil companies, etc.

Removing zinc and phosphorous from oil is being done for the same reasons as lead being removed from gas, sulpher being removed from diesel fuel and alcohol being added to gas. None of it is good internal combustion engines, especially older ones.
oh my Lord. like I said, you wanna run crazy spring pressure with a mech. cam on the street, you take your chances. i don't care what oil you use. want to play it safe? run a roller. that shouldn't even be debated. whats truely amazing is that everything the reputable engine,cam,oil,etc companies say on why zinc is this or that.. there isn't millions of non-roller cam failiors in all kinds of cars everyday. last time I looked, there wasn't.