[57taskforce]

For what it’s worth, most Napa filters are wix rebrands… variable valve timing uses an oil psi controlled cam phaser to manipulate the cam timing within a certain programmed amount of degrees to give the best possible low end torque and high end end Hp, and fuel economy. It wasn’t available on the LS stuff until Gen 4 came out in early 06 in the GMT 900 trucks/suv’s