850 cfm HP 4 Barrel Double Pumper Carburettor with Mechanical Secondaries

Power, precision, and instant throttle response come together in the Aeroflow 850 CFM HP 4-Barrel Double Pumper Carburettor with Mechanical Secondaries. Engineered for drag and street/strip competition, this square bore 4150 flange carburettor is built to feed high‑output engines with immediate, responsive fueling, and it arrives with a sleek silver finish and no choke for streamlined cold-starts in racing environments.

Why this carburettor stands out

• 850 CFM HP 4-barrel configuration with a true double pumper design, delivering fuel to both accelerator pumps for rapid tip-in response and improved launch traction.
• Dual accelerator pumps paired with mechanical secondaries provide strong, predictable fueling under high load across the RPM range.
• Square bore 4150 flange design ensures broad compatibility with a wide range of performance intake manifolds.
• No choke configuration simplifies tuning and cold-weather start tuning in racing environments.
• Lightweight diecast aluminum construction combines rugged strength with ease of handling and tuning potential.
• Four-corner idle adjustment and screw-in air bleeds enable precise, repeatable idle quality and air–fuel balance adjustments.
• Dual inlet fuel bowls with sight glass windows let you safely check and adjust float levels quickly and easily.
• Bolts onto your engine as a turnkey, performance-ready unit with straightforward tuneability for smooth throttle response throughout the power band.
• Classic silver finish delivers a performance-forward look that complements high‑performance applications.
• Available in multiple CFM ratings from 650 to 850; this model is the 850 CFM variant designed for high-power builds.
• Ideal for drag racing and street/strip competition, delivering more serious power and a stock-to-race transition that racers rely on.

Performance and tuning in practice

With a double pumper design and mechanical secondaries, expect rapid throttle response at tip-in and strong mid‑range fueling during aggressive passes. The combination is aimed at reducing bog during initial throttle application while maintaining steady, predictable power delivery as RPM climbs. The four‑corner idle adjustments and air bleed screws give you precise, repeatable tuning control, helping you dial in idle quality and air–fuel balance for your specific setup and track conditions. Dual sight‑glass bowls simplify float level checks, so tuning remains straightforward, even in a busy pit environment.

Fit, finish, and compatibility

Designed as a bolt‑on upgrade, this carburettor is compatible with common performance intake manifolds thanks to the square bore 4150 flange. The no‑choke configuration reduces complexity in cold starts during racing, while the durable silver finish adds a classic performance aesthetic and stands up to track use. If you’re upgrading a high‑output engine for drag or street/strip performance, this 850 CFM unit is engineered to deliver consistent power with tunable, predictable fuel delivery across the power band.