Chevy Gen 1 with Fast Burn heads, hydraulic roller cam, roller rockers. With #1 at top dead center and the rockers adjusted to zero lash, I can compress the exhaust lifter internal plunger spring by pushing down on the rocker. I cannot do that on the intake lifter. It's solid as a rock. I checked every other lifter in the motor, and all have some free play. To confirm, I took the rocker arms completely off, and pushed down on the exhaust pushrod and get the play I expect, but not on the intake side.

I think the internals of the lifter are toast. Opinions?

https://youtu.be/1ZT29cSy8xw