well, i only change 6 of them..
cause thats all i bought off a friends dad, so i gave it a quick shot. i just need to replace 3 other ones and if that doesnt work then im gonna drown it in gas and light thge **** car up
it only takes me 25 mins to get the driver side valvecover off anyway so no big deal there. i dont even have to touch the hydro booster or jack the motor up..