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Carburetors, Ultra XP, 650 cfm, 4-barrel, Square Bore, Mechanical Secondaries, Dual Inlet, Shiny and Black Finish, Down-leg Booster, Each

Holley's Ultra XP carburetors are up to 38 percent lighter than their traditional carbs, offer 20 percent greater fuel capacity, and include a host of other features. One of the main perks is an integrated idle bypass valve that allows for idle adjustments while maintaining the proper throttle-plate-to-transfer-slot relationship. You'll also get all-aluminum construction, fully tunable billet metering blocks, billet base plate, adjustable secondary linkage, and knurled (hand-adjustable) curb idle screws. Enjoy the ultimate in square-bore race carbs; order the Ultra XP carburetor with options best suited for your race application!

Some of the many other features include:
• Your choice of several finishes and CFM ratings (from 600 to 950)
• Contoured Venturi inlet offers balanced airflow for increased hp
• Dual accelerator pumps provide the perfect amount of fuel, from idle to full-throttle
• Clear sight windows on both sides of bowls for safe and easy fuel level adjustments
• -8 AN (O-ringed) inlet threads offer a large variety of plumbing options from either side
• Mechanical secondaries for perfect off-the-line launches
• 100-percent wet-flow tested by Holley technicians