Problem may not be with the lifter. They usually will not stick up in the bore.
I lean towards a stuck valve possibly. Alot less lubrication in this area and most likely to stick. As lifter comes up the push rod meets an imovable object ( valve ). "It Bends". Seen this before in other engines big and small.
What do you think Merlin 2021.
Saturday, March 8th, 2008 AT 11:36 PM