1997 5.9L Magnum Roots Supercharging and Fitment

The Magnum engine is rated at a 9.0-1 ratio which is at least 1pt. higher than the max you want to super charge a cast piston and crank set up. This is where the "Limits" come in.

Add a much thicker gasket for marginal added boost because the gasket becomes the seeker link in pressuring above the Mello 5psi suggested limit of the 9.0-1 ratio.

Roots chargers are excellent at low end while the snails are looking at the big end.

IMO, limit yourself to 8 & no more than 10 psi of well tuned parts and you will be fine. Even small amounts of boost add excellent and amazing amount of power.