With an 850-cfm carb as the baseline, we wondered how much power might be lost going to a smaller 750 cfm. We had the new Holley 750 Ultra Double Pumper on deck, and it made power very nearly in lockstep with the bigger carb. These new Holley carbs are manufactured in aluminum, representing a weight savings of approximately seven pounds compared to their traditional cast zinc counterparts. The 750 Ultra runs about $522.69 through Summit, or about $4 less than the 850. Besides the all-aluminum construction, the Ultra also has sight glasses in the fuel bowls and an electronic choke for improved driveability. You also get your choice of black, red, or blue anodized baseplate and metering blocks.