BR-67255 Carburetor 4150 Model 650 CFM Square Bore | Mechanical Secondary, Electric Choke

Overview

The BR-67255 carburetor is a 4150-style replacement designed for engines that breathe through a 650 CFM four–barrel setup. With a square-bore flange, mechanical secondary throttle, and an electric choke, it provides a balanced, reliable upgrade path for compatible Holley Quick Fuel Brawler systems. This design focuses on consistent starts, steady fuel delivery, and straightforward installation, making it a thoughtful option for enthusiasts seeking a practical improvement over stock components.

Key Benefits at a Glance

• Dual inlet fuel bowls with sight glass windows let you monitor fuel levels at a glance, simplifying float adjustments.
• Electric choke supports smoother cold-weather starts and helps transition to normal running more predictably.
• 650 CFM four-barrel configuration offers a balanced air/fuel mix for a wide range of driving styles.
• Primary main jet #70 and secondary main jet #74 provide a tunable baseline for mixture control.
• 1-11/16 inch throttle bore enhances throttle response and overall drivability.
• Durable, lightweight die-cast aluminum construction resists heat and corrosion for lasting reliability.
• After-sale support and a 12-month return policy add a layer of confidence when choosing a replacement part.

Specifications and Fit

• CFM: 650
• Type: 4-barrel with square-bore flange
• Choke: Electric
• Jets: Primary #70, Secondary #74
• Throttle bore: 1-11/16 inches
• Material: Die-cast aluminum

Real-World Use Scenarios

Whether you’re upgrading a street-oriented ride, restoring a classic, or dialing in a weekend project, this carburetor aims to deliver predictable starts and smooth acceleration. The electric choke reduces cold-start cranking, while the dual sight glasses help you keep the float levels in check during tuning sessions. The square-bore flange makes for a straightforward fit on compatible intakes, supporting a cleaner installation and fewer surprises during assembly.

Durability, Support, and Peace of Mind

Built from lightweight die-cast aluminum, the BR-67255 unit is designed to withstand heat and exposure without sacrificing structural integrity. If questions arise, the after-sale support team is available, and you’re covered by a 12-month return policy to help ensure satisfaction after purchase.

Usage Tips and Getting Started

Before installation, verify compatibility with your 4150-pattern intake and confirm the 650 CFM rating matches your engine’s needs. After installation, use the sight glasses to verify float levels, and consult your tuning resources to tailor the jet sizing to your specific fuel and ignition setup. This approach can help you explore a range of comfortable, drivable states without overpromising results.