That is correct, 2 pins per cylinder, each pin controls the rocker for two valves (16 valves in total). the lift bolts hold down the rocker shaft, which is essentially an oil passage. the oil control valve opens at 6000rpm, sending oil through the rocker shaft to each high cam follower, thus pushing the pin and forcing the valves to operate off of the high cam. so should these bolts break, its possible for the shaft to rotate, thus closing off the oil passage to each cam follower, and goodbye lift.casper8653 said:I have a question. If the the pin in the rocker, is what allows the high cam lobe to be used which therefore pushes the valves in deeper: does that mean that there is two pins per cylinder (intake, exhaist) ? I am assuming the answer is yes, either way my question will still stand...where do the lift bolts come in?