Performance Carburetor supplied two of their Stage II 4150 HP based blow-through carburetors for our tests. The one on the left was calibrated for pump premium and 15-psi maximum boost. It was also set up for dash 6 fuel lines from the boost-referenced fuel pressure regulator. The carburetor on the right was calibrated for E-85 and 15-psi maximum boost, but was set up for dash 8 fuel lines from the boost referenced fuel pressure regulator, as needed to supply the 20- to 30-percent more volume E-85 required. The F-1 ProCharger with a 70-tooth crank pulley and a 44-tooth supercharger pulley reached 15.5 psi during the tests, and the carburetors worked well.