adjustable pushrods

available for all nailheads.  originally valve train was not adjustable.  these are very strong.  we use these on all our in house builds.  great to absorb the clearance changes of different head gaskets, machine work, and replacement valve train parts.  to adjust preload, start at zero lash on base circle.  mark with paint pen and turn out the adjustment one exact turn for .030.  use THREE wrenches to lock it down