The lifters themselves have issues?? that stinks,the 2 fellas at work,the escalade used oil like 500 miles to a quart and the avalanche had crazy driveability issues related to the DOD,The shop did recommend a "camswap" with different lifters,they told me[plus headers,transtune blah blah blah],Maybe they should peddle those things while they still Run!! LOL,Kinda glad I still drive old junk!! Later Steve!!