[Rufas]

Originally Posted by 71CHEVYSHORTBED402

While I'd be tempted to run with some of these recommendations, there's always this. Unless I'm missing the point (it's a little long), the guy's test results do not support zinc or break in oil. https://540ratblog.wordpress.com/201...-test-ranking/

Beautiful engine.

I think you will find most cam manufactures recommend a zinc conventional oil for flat tappet cam break in. Zinc is not required on most of today's engines that are roller type tappets.

http://www.cranecams.com/whats_newview.php?s_id=36

http://howardscams.com/i-24078662-ho...-additive.html

http://www.hotrod.com/articles/ccrp-...ak-in-new-cam/

I didn't run oil with enough zinc additive in this 468 BBC with flat tappets. Cam went flat in less then 6,000 miles. It now has a roller cam in it.