440 problems (take 2)... More known values

Will do!! Looks like I have a day off next week so hopefully I can get my spring height checker in and get the heads set up before that time comes. Should be able to get everything installed in a days time.

Now on to some oil question. I work at a local parts store and if I am not mistaken, the reason todays oil sucks is because of the zinc content. Modern engines are mainly roller or has a design that keeps the break in process a bit more simple and doesn't really need the same zinc content as older engines.

I called around to a few of my petrleum engineer friends that currently work for a few of the industries that refine and produce the oil for most retail stores. I was informed that the only oil in most parts stores that have a decent zinc content is the quaker state defy, royal purple, and ZR1 oil, all of which have a 600 PPM zinc content. I know that I can buy the additive to replace the missing content required for a flat tappet cam break in, but when is enough.... enough?

There is a ton of information on the web about cam break ins and whatoil to use, however I find it ridiculous that break in oil is so expensive, but only contains more zinc?

How often do you guys add the zinc additive into your normal oil changes, and what did you guys do for a break in. I would like to do this right the first time.


Thanks in advance