How much milled off heads to raise compression

One key to really taking advantage of that is to run more deck clearance so when the crank starts adding cubes, it’s not limited by touching the heads too early in the flex stage.

It’s not only variable displacement, but the byproduct of that is the variable CR.

The real April fools day thing I noticed in this thread was the 300cfm stock magnum heads.
Does Rhoads make lifters for this application?