Oils

So I've been reading on another website how newer oils can kill the life of a hyd flat tappet cams. What would be a good oil to run that has enough zinc in it?

Motorcraft Diesel 15W40 has 1335ppm ZDDP,Rotella has been reduced to about 1100ppm,the Motorcraft is about $16 for a 5 quart jug at Autozone or Wal-Mart.Some will tell you Valvoline 20W50 Racing oil is a good bet,Royal Purple and some other brands have a "break-in oil" but they can be pricey.

So diesel oils have a higher content than the regular car oils then?

Or just use a ZDDP additive, like ZDDPlus or others:
http://www.zddplus.com/

Not all Diesel Oils will meet the needs of a flat tappet cam. Rotella is only marginal but it will work depending complettly on the cam SPECS. If you are running a stock cam you will be fine with the Rotella, but high performance cams are going to need more of the ZDDP. When you start running after market springs with there increased spring rate that is when the modern oils of today let you down.

The two oils that I personally will trust are valvoline Racing oil and Brad Penn oil. Both have the required additive pack that will give a flat tappet cam even a chance at living. Also both of those oils have plainly stated on the label "Not For Highway Use" that is because the ZDDP clogs the cat's on modern cars, thus the reason the additive pack containing ZDDP was dropped, and reduced in Rotella. I am not familar with the Motorcraft Oil mentioned by jeffB2 but if it does in deed contain 1335 PPM of ZDDP then you should be fine.

beat a dead horse one more time on the parts of zddp .it will not matter if it the zinc will not..... work .if your lucky may work ??? feel lucky....you need a fast burn zinc . thats not in diesel oil ....do not take my word... i am dumb i just buy what works go on joe gibb s they will tell you the same as i stated . diesel oil is for diesel not break in a a gas engine. buy the oil made for the break in its not pricy think about the price of a cam and lifters i am a dealer for brad penn and joe gibbs its not that bad .cant find some one up buy you i can ship a case to you