These carbs feature PTFE® coated, slabbed throttle shafts with low profile button head screws and anodized aluminum throttle plates for improved air flow and corrosion protection. The twelve hole billet booster inserts provide an improved fuel signal and superior fuel atomization. Other features include billet metering blocks with adjustable emulsion, idle feed, and power valve channel restrictions for infinite tunability to each engine. Clear fuel level sight glasses in the polished aluminum fuel bowls make for easy, no mess float adjustments. The old troublesome internal linkage has been replaced with a fully adjustable external linkage that can be adjusted for 1:1, progressive, or soft progressive throttle activation.