410 LA small block will not rev past 6000

Here’s a screen shot from a test on a 427bbc that was having some HR lifter issues after 6400rpm.
Courtesy- Nicks Garage:

6A22B6FA-511C-4450-A61E-692E91A6BB68.png

It’s good……..right up until it’s not.
Actually, getting 6400 out of a HR in one of those is pretty good.