<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I’m not 100% on this so others can chime in and correct me. <div><br></div><div>My understanding is when the cam rolls by and lifts the tappet it will also rotate it a little bit so it doesn’t continue to strike the same spot over and over and over. Too much zinc, too slippery, doesn’t rotate the tappet, wears the cam lobe prematurely.<br><br><div id="AppleMailSignature">Sent from my iPhone</div><div><br>On Sep 9, 2018, at 1:17 PM, Paul Dorsey <<a href="mailto:dorpaul1@gmail.com">dorpaul1@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div>Don’t we have flat tappet engines? Why do they need to rotate?</div><div><br><div class="gmail_quote"><div dir="ltr">On Sun, Sep 9, 2018 at 2:58 PM Rye Livingston <<a href="mailto:ryel@mac.com">ryel@mac.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">FYI - if a little zinc is good, a lot is NOT better. Things get too slippery and the tappets don’t rotate on the cam lobes. I learned this the hard way and the machine shop informed me of the error of too much zinc.<br>
<br>
So either Valvoline, Brad Penn or Kendall that have ZDDP, or half a bottle of Red Line break-in oil per instructions, is the way to go.<br>
<br>
Rye<br>
<br>
Sent from my iPhone<br>
<br>
On Sep 9, 2018, at 7:24 AM, Randall <<a href="mailto:tr3driver@ca.rr.com" target="_blank">tr3driver@ca.rr.com</a>> wrote:<br>
<br>
>> Five or 10 years ago I didn't think there was much of an <br>
>> zinc ingredient in Valvoline racing oil. Have things Change D?<br>
> <br>
> There was a brief period where they reduced it slightly; but Valvoline<br>
> Racing has always had ZDDP in it. It's not entirely clear to me that 900<br>
> PPM is worse than 1100 PPM as long as you change oil frequently; more just<br>
> lets you run the oil longer before it is depleted. But the consumer<br>
> reaction was apparently enough to convince them to put it back up.<br>
> <br>
> -- Randall<br>
> <br>
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