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BRAND NEW HOLLEY ULTRA XP CARBURETOR, HARD CORE GRAY & BLACK FINISH, 650 CFM, MECHANICAL SECONDARIES, NO CHOKE, MODEL 4150, COMPATIBLE WITH GASOLINE

HOLLEY ULTRA XP CARBURETORS OFFER NEW FEATURES SUCH AS AN INTEGRATED IDLE BYPASS VALVE THAT ALLOWS FOR IDLE ADJUSTMENTS WHILE MAINTAINING THE CORRECT THROTTLE PLATE TO TRANSFER SLOT RELATIONSHIP, HIGH CAPACITY FUEL BOWLS WHICH FEATURE 20% MORE FUEL CAPACITY TO ELIMINATE STARVATION, INTEGRATED FUEL SHELF TO MINIMIZE FUEL AERATION & INTERNAL BAFFLING TO CONTROL FUEL SLOSH.

OTHER FEATURES INCLUDE ALL ALUMINUM CONSTRUCTION, FULLY TUNABLE BILLET METERING BLOCKS, BILLET BASE PLATE, ADJUSTABLE SECONDARY LINKAGE AND KNURLED (HAND ADJUSTABLE) CURB IDLE SCREWS. HOLLEY ULTRA XP CARBURETORS ARE THE ULTIMATE IN SQUARE BORE RACE CARBURETORS!

NOTE: THIS MODEL OF CARBURETOR HAS THE SQUARE BORE FLANGE BOLT PATTERN. IT CAN REPLACE HOLLEY, EDELBROCK, CARTER AFB, AND AUTOLITE STYLE CARBURETORS WITH 5 3/16" X 5 5/8" BOLT PATTERN. IF YOU HAVE A SPREADBORE STYLE INTAKE MANIFOLD, YOU WILL NEED AN ADAPTER TO INSTALL THIS CARBURETOR. SIMILAR TO THE MR. GASKET #1932.

FEATURES:

• HARD CORE GRAY W/ BLACK ANODIZED BILLET ALUMINUM METERING BLOCK & BOOSTER INSERTS
• COMPATIBLE WITH DRAG RACE, CIRCLE TRACK OR HIGH HP ENGINES
• CONTOURED VENTURRI INLET OFFERS BALANCED AIRFLOW FOR INCREASED HP
• AIR BLEEDS MOVED OUTWARD TO ALLOW SMOOTHER TRANSITION OF AIRFLOW FROM TOP OF CARBURETOR INTO VENTURII
• METERING BLOCKS FEATURE IMPROVED DURABILITY, TRUE GASKET SEALING & FULLY ADJUSTABLE (EMULSION BLEEDS, POWER VALVE CHANNEL RESTRICTORS & IDLE FEED RESTRICTORS)
• INTEGRATED IDLE BYPASS VALVE
• DUAL 30CC ACCELERATOR PUMPS PROVIDE THE PERFECT AMOUNT OF FUEL FROM IDLE TO FULL THROTTLE
• FUEL BOWLS PROVIDE 20% MORE FUEL CAPACITY WHILE CONTROLLING SLOSH WITH INTERNAL BAFFLING
• CLEAR SIGHT WINDOWS ON BOTH SIDES OF BOWLS FOR FUEL LEVEL ADJUSTMENTS
• BUILT IN DRAIN PLUG IN FRONT CENTER OF BOWL PROVIDES EASY ACCESS TO EMPTY CONTENTS OF BOWL
• 8AN (O-RINGED) INLET THREADS CAN BE PLUMBED FROM EITHER SIDE
• 4 CORNER IDLE ALLOWS YOU TO PRECISELY CONTROL YOUR IDLE SYSTEM
• MECHANICAL SECONDARIES FOR PERFECT OFF THE LINE LAUNCHES
• ELONGATED (DUAL PATTERN) MOUNTING HOLES ALLOW FITMENT ON INTAKES WITH SQUARE FLANGE (HOLLEY 4150 STYLE) OR LARGE FLANGE (HOLLEY DOMINATOR STYLE)
• KNURLED (HAND ADJUSTABLE) PRIMARY AND SECONDARY CURB IDLE SCREWS ALLOW FOR EASY IDLE ADJUSTMENT WITHOUT THE USE OF TOOLS
• PRIMARY THROTTLE SHAFT CAPPED TO PREVENT ENTRY OF DEBRIS & CONTAMINATES
• FACTORY MACHINED ACCESSORY MOUNTING
• NEW SECONDARY PUMP CAM LEVER DESIGNED TO PROVIDE POSITIVE THROTTLE STOP ON SECONDARY SIDE
• STAINLESS STEEL ADJUSTABLE SECONDARY LINK. PROVIDES CHOICE OF 1:1 OR PROGRESSIVE SECONDARY THROTTLE ACTUATION FOR ULTIMATE CONTROL OF SECONDARY OPENING RATE
• BASEPLATE DESIGNED WITH A BOSS THAT CAN BE CONSUMER MACHINED FOR VACUUM SOURCE
• INCLUDES NOTCHED FLOAT & JET EXTENSIONS
• 100% WET-FLOW TESTED

SPECS:

• BARRELS: 4
• BILLET COLOR: HARD CORE GRAY WITH BLACK
• BOOSTER: DOWN LEG
• BRAND: HOLLEY
• CARBURETOR USE: PROFESSIONAL RACE
• CFM: 650
• CHOKE: NONE
• CIRCUIT: 2
• FINISH: HARD CORE GRAY
• FUEL: GASOLINE
• FUEL INLET: DUAL
• MARINE USE: NO
• MATERIAL: ALUMINUM
• MODEL: 4150
• PRIMARY MAIN JET: 70
• PRIMARY POWER VALVE: 6.5
• PRIMARY PUMP NOZZLE SIZE: 32
• PRODUCT TYPE: CARBURETOR
• SECONDARIES: MECHANICAL
• SECONDARY MAIN JET: 70
• SECONDARY PUMP NOZZLE SIZE: 32
• SUPERCHARGED APPLICATION: NO
• THROTTLE BORE: 1.688 INCH
• VENTURII SIZE: 1.250 INCH

YOU CAN VIEW AND DOWNLOAD THE COMPLETE ASSEMBLY INSTRUCTION BOOKLETS FOR THIS CARBURETOR HERE.