First cam cam was regrinded and lifters were used stock, no wonder why two lobes went bad especially when car didnt start for ages.
Second was schneider cam with comp cams lifters and after proper brake in, fifth cylinder started to pop.
I opened valve cover and lash cap was dropped and so was pushrod.
Exhaust lobe were 2mm down.

Like my garage neighbour said: Maybe there are reason why Y-Block enthusiasts are so rare.


Hyvinkää, FI

The lifter face must be convex to help with lifter rotation along with the rake angle on the lobes.  Most solid lifter flat tappet lifters are ground with a 50-52 inch radius and while the exact radius cannot be determined without some specific instruments, the radius can be observed by placing a straight edge across the face of the lifter and observing that the center is slightly higher than the outside edges.  If lifters are found to be flat and/or concave (lower in the middle than on the outside edges), then those lifters needs to be discarded.  As long as new lifters are available, I’m not an advocate of regrinding the lifters.
 
If the lifters pass the initial ‘looks okay’ test and you want to try reusing them, then try to make sure they are still rotating the same direction as they were before.  Putting them back in the same lifter holes will help with this.  When the lifters were initially broken in, they did so rotating in a specific direction.  Reversing this rotation can lead to another cam/lifter failure.

Lorena, Texas (South of Waco)