[goodyear1984]

whenu have pedistal mount rockers u cannot adjust them like a stud mount,,,you need 0 valve lash and with the bolt on style you have to get the lash close to 0 as possiable..if some of the rockers are arent shimed right they will load the lifter u get a backfire.theres many different ways to check but the easy way its to get the shim kit from ford racing and take 1 rocker off at a time when the valve is closed and put the thinest shim under it re torque.see if the rocker has any lash/play in it if the rocker has lash/play in it take the shim out and that rocker is good.if there is no play the go the next size up untill there is no lash..dont be suprised if ur motor doesnt need any shims..u can change the valve lash by milling the heads,changing the cam,using a thinner head gasket.u can make ur life easy and get a stud mount rockers and set them at 0 lash and turn 1/2 to 5/8 of a turn