hello ppl.. well i have a 02 jeep liberty 3.7l v6 and it started making a knocking sound.. ive got it tore down to the block (while its still in the jeep) and so far ive only found broke timing chain guides.. anyways ive done alot of performance upgrades like cold air intake, hotter coils, better injectors, hollowed out both cats/ deleted the 3rd, installed a 12inch glass pack. love the sound of it, bored out the throttle body for better flow. had a performance chip but sent it back because it really didnt do anything. installed slotted & drilled rotors and better pads, really want to put discs on back to can the drums but thats another later job. but after all that she started to really open up more. but was wanting to do some better performance upgrades internally since shes mostly in pieces. can i use earlier model 3.7l cams in my 02?. i assume id have to use my cam gears from the 02. but wanting a better cam without using aftermarket. instead using newer model cams from the 3.7ls. dont really have alot of money so figured i could find cams from a junk yard but earlier year.. thanks.