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Is this a new rebuild?
The story goes that Zinc was removed from oil and this said zinc is needed in the critical break-in period
I read in grassroots motor sports how David Vazird cured a problem on a GM truck that had lifter clatter using Royal Purple oil
On cam and lifter changes proper break-in is essential
Now more than ever since they removed the zinc
http://royalpurple.com/breakin-oil.html
HTH
David
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