The small sixes ranged in size from 144-170-200-250 ci.
The 144s had solid lifter cams and adjustable rockers.
The adjustable rockers can be installed on later heads with hydraulic lifters and is a good idea if the head and/or block has been milled.
The pushrods were way out of adjustment. Some of them were very loose, some of them were very tight.
Had I not needed to pull the valve cover it may have been a year or more before I found this, probably would have found it when that pedestal gave way or the hose clamp slipped and some bad noise resulted.
1965 Mustang Coupe 289/C4
1967 Mustang Coupe 200/C4
2017 Mustang EB Premium