The Holley 0-80688 is a high-performance 4-barrel carburetor featuring precision-machined components and hand-assembled construction. This Street/Strip carburetor is calibrated for superior throttle response and optimal fuel atomization. Built with Holley's proven design features, it includes an electric choke, vacuum secondaries, and four-corner idle adjustment for precise tuning capabilities.

Technical Specifications:

• Design: 4-barrel square bore
• CFM Rating: 750 CFM
• Primary Venturi Size: 1.375"
• Secondary Venturi Size: 1.375"
• Main Body: Lightweight aluminum
• Fuel Bowl Capacity: 3.8 oz per side
• Float Type: Hollow brass
• Power Valve: 6.5 standard
• Air Cleaner Flange: 5-1/8"
• Throttle Bore: 1.688"
• Base Plate: Universal flange
• Finish: Chromate dichromate
• Weight: 13.5 lbs
• Jets: Calibrated stainless steel

Core Components:

• Vacuum Secondary System
• Electric Choke Assembly
• Four-Corner Idle System
• Dual Feed Fuel Inlets
• Notched Secondary Floats
• Clear Sight Glass Windows
• High-Flow Needle & Seat (0.120")
• Screw-in Air Bleeds
• Quick-Change Power Valve

Calibration Features:

• Primary Metering Jets: #73
• Secondary Metering Jets: #82
• Primary Power Valve: 6.5 PVCR
• Idle Feed Restrictions: 0.031"
• High-Speed Air Bleeds: 0.028"
• Idle Air Bleeds: 0.070"
• Idle Mixture Screws: 4
• Vacuum Secondary Spring: Purple
• Secondary Diaphragm: Standard

Tuning Capabilities:

• Four-corner idle mixture adjustment
• Changeable primary/secondary jets
• Adjustable accelerator pump
• Interchangeable power valve
• Adjustable float levels
• Vacuum secondary adjustment
• Electric choke adjustment
• Fast idle adjustment

Performance Specifications:

• Optimal RPM Range: 1800-6800
• Throttle Response: 0.2 seconds
• Fuel Flow: 750+ CFM at 6.5 PSI
• Accelerator Pump Shot: 30cc
• Power Valve Channel Restrictions: 0.052"
• Booster Type: Down-leg
• Booster Design: High-performance
• Fuel Line Size: 3/8" dual feed

Installation Requirements:

• Throttle Linkage: Manual or automatic
• PCV Compatibility: Yes
• Fuel Pressure: 5-7 PSI
• Choke Power: 12V
• Air Cleaner Stud: 5/16-18
• Base Gasket: Included
• Mounting Hardware: Included

Compatibility:

• Most V8 engines
• Manual/automatic transmissions
• Street performance vehicles
• Mild race applications
• Engines up to 600 HP
• Standard square bore intake manifolds
• Both spread and square bore patterns