Testing a ProCharger bonnet against a Vortech enclosure

And How Changing Carburetor Boosters Gained Over 50HP.

In Lamar Walden’s engine shop, the dynamometer hurtled around to 5,997 rpm and recorded 627.5 hp. The engine, a 383ci small-block Chevrolet, empowered a Vortech S-Trim supercharger that generated 10 pounds of boost and directed its charge through a ProCharger bonnet and Demon Carburetion’s new 750-cfm blow-through carburetor.

Suddenly the test expanded from two contenders to four: bonnet against enclosure, down-leg boost venturii against annular. The results were startling. Read the complete story as it appeared in Drag Racer magazine’s 2013 November issue.