atomarc:....."most engines with flat tappet cams aren't effected" ......

I think so?! I would say especially them!
A local shop just recently ruined a nice rebuild job by putting in oil that did not have the proper Zinc additive and I personally felt the lifters which were dipped out real bad and also the cam lobe was practically round. All this happened in very few miles.
Randy, if you do a search on this you will find seveal posts about this problem and I remember one that I personally started because of the engine failure I just mentioned. The thread got pretty long and is FULL of info.


1937 Chevy Pickup
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1952 Chevy Panel
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1950 Chevy Coupe
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I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile