Knock and smoke

"No break in needed on a used cam and lifters if they are put back in order,"


Not true. The term "break-in" on a used cam isn't a correct term to use either. It is important for the lifters to be installed on the cam lobes that they were run on. The reason that you want to do a "break-in" on a used cam, or any cam for that matter, is because on initial start-up, you don't have oil pressure for a few seconds. What you do have is the cam lobe surfaces and the lifter bottom surfaces lubricated only by the Moly-disulfide (MO S2 for you chemists) lubricant that was, or hopefully, was put on those surfaces. That doesn't last long while the engine is running. For the new cams, the zinc in the break-in oil comes into play as the cushion on these surfaces once oil pressure is obtained and the engine is run for a short while.

Just my 2 cents.

Ken
Edison, NJ