Yes I have - and actually - almost had a catostrophic failure with the LT1 cam due to TOO MUCH ZDDP.
I had foolishly assumed that if one bottle of ZDDP+ was good, then a bottle and a 1/2 would be better insurance -
BOY was I wrong - after 800 miles, the lifters had spalling - but not obvious damage to the cam lobes and it mic-ed out correctly
I do however have more spring pressure than the stock Z28 springs - but not 130-140lbs like the current solid flat tappets want
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