AED Performance offers our exclusive T-6 Billet aluminum metering blocksĀ for the ultimate in fuel curve tuning and adjustability. Our standard metering blocks come with fixed orifice sizing and a great tune up right out of the box while our Pro Series blocks come with screw in restrictors and feature 5 emulsion bleeds for maximum performance and power throughout the RPM range. These exclusive AED metering blocks are available in Gas, Alky and E-85 applications.