anyone know how to tighten up slack in lifters just installed new head new cam new lifters but theres too much play between cam and the rocker which is causing it to make a taping noise engine runs fine but noisy a guy from the head shop said the aftermarket lifters are slighty smaller than stock ones so just place some spacers below the lifters anyone heard of that any info would be appreciated thanks its a 89 sunbird gt 2.0