Lifter clacking

[Davegt74]

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

[timo944]

David,

Appreciate the thought. Yes it's a new motor, though this issue didn't appear until race # 3. I used Joe Gibbs break in oil at start-up and for dyno testing and am now using the Valvoline "racing" 20W50 that is supposed to be high in zinc and other critical materials. I debated trying a different oil but have done so yet...

Tim