best oil for cam breakin

You should research products with high Zink & Phosphorus (ZDDP/ZDTP) levels in them. Pretty critical for break-in periods, and quite a few companies offer them. I’m not into promoting products, I’m into more of the product contents rather than advertisements. That being said, I was given some Joe Gibbs break-in oil, and I will say….. The last couple of break-in’s have actually sounded smoother. For me, I only run engine oil that has the highest Z&P levels. Like removing lead from fuel, adding Ethanol to fuel & phasing out Z&P in oils, companies are killing older engines by removing elements that kept them happy!
My2cts

A good read re: Lifters & cam's

http://blog.hemmings.com/index.php/2012/10/18/tech-101-zinc-in-oil-and-its-effects-on-older-engines/