650 cfm HP 4 Barrel Double Pumper Carburettor with Mechanical Secondaries

Meet the Aeroflow 650 CFM 4-Barrel Double Pumper Carburettor with Mechanical Secondaries — a silver, square-bore 4150 flange unit built for drag and street/strip setups where power isn’t negotiable. With no choke and a tune-ready foundation, this carburettor delivers extensive top-end grip while remaining dependable for daily driving in a bolt-on package.

Two-pump performance with precise timing

• Double-pump design with mechanical secondaries delivers immediate fuel when you hammer the throttle, enhancing throttle response and power across the power band.
• Two accelerator pumps ensure rapid fueling under load, helping your engine stay crisp from mid-range to the top end.

Why this Aeroflow carburettor stands out

• 650 CFM, 4-barrel configuration provides strong mid-range punch and impressive top-end power for serious applications.
• Mechanical secondaries offer predictable, tunable timing ideal for race-oriented setups and consistent performance.
• Dual inlet fuel bowls with sight glass windows let you safely monitor float levels at a glance.
• Four-corner idle adjustment and screw-in air bleeds give precise control over idle quality and transitional behavior between idle and light throttle.
• Lightweight diecast aluminium construction keeps weight down without sacrificing strength, aiding throttle response and durability.
• Choke-free design tailored for race environments while maintaining bolt-on compatibility for straightforward installation.
• Four-corner idle screws and air bleed screws enable nuanced tuning for street-to-strip versatility.
• Bolt-on, ready-to-run installation with dependable run-performance out of the box and easy tuneability.

Specifications at a glance

• CFM: 650
• Barrel: 4-barrel
• Secondary mechanism: Mechanical secondaries
• Flange: Square bore 4150
• Choke: No choke
• Finish: Silver
• Material: Diecast aluminium
• Idle adjustment: Four-corner
• Air bleed: Screw-in
• Float bowls: Dual inlet with sight glass windows
• Installation: Bolt-on, ready-to-run
• CFM range availability: 650–850 CFM

Designed for drivers pushing beyond standard street performance, this carburettor blends the lightness of diecast aluminium with practical tunability. The sight-glass bowls simplify float checks, while the four-corner idle and air bleed adjustments offer refined control over idle and mid-throttle transitions. If you crave quick throttle response and steady, high-power delivery, this unit is built to meet the challenge—delivering race-ready performance without sacrificing daytime drivability.