High compression blues.

Actually, camshafts do not bleed off compression and duration really has little to do with it. It's when the intake valve closes. A later IVC will build less cylinder pressure than one that closes earlier, because the intake closes later, allowing the cylinder to not be filled as completely, so "bleed off" is technically incorrect. Air normally trapped in the cylinder, will simply end up in the intake manifold. While duration does play a role, it's the IVC that you really should pay attention to.

Here is a pretty good article about valve events.

https://www.mechadyne-int.com/app/u...ation-on-engine-performance-and-emissions.pdf