HP series with a new contoured venturi main body equipped with screw-in air-bleeds, stainless steel throttle blades with buttonhead screws, strengthened metering blocks, and Dominator-style fuel bowls. Following the HP, Holley produced the HP Ultra version, which upgraded to black-anodized billet metering blocks with screw-in idle feed and emulsion jets and a billet baseplate. The HP Ultra is an expensive carburetor, so Holley introduced a much more affordable Street HP 750 in the bright finish in either vacuum-secondary (PN 0-82750) or double-pumper (PN 0-82751) configurations. These carbs offer screw-in air-bleeds and a street/strip calibration that is leaner than the HP and Ultra.