No its just a bolt down pedestal type set up. You can get shims to put under the pedestal if you have to much preload on the lifter. but you sound like you got some slack. See if you can determine which side and approx. what cylinder and pull the valve cover. Bump the engine over and check for play and then pull that rocker assembly and check for wear at either pushrod cup or at the fulcrum. Sometimes the pushrods get cloged and then little or no oil goes to that rocker. You could also have a weak lifter or loose valve guide.
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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