PROFORM has has really done it this time with their new affordable high-performance race carburetors. The new Race Series Carburetors from PROFORM is hand assembled in the U.S.A. Each carburetor uses a PROFORM high-flow carburetor main body, durable billet metering blocks, and a high-performance billet throttle base plate. Each part of these carburetors are hand assembled in the U.S.A. The main body has a high-rate air flow section design while the throttle base plate and metering blocks are constructed out of solid billet aluminum.