Edelbrock Performer 1405 600 CFM Square‑Bore 4‑Barrel Carburetor — Air‑Valve Secondary, Manual Choke

The Edelbrock 1405 Performer is a 600 CFM, square‑bore, 4‑barrel carburetor with air‑valve secondary and manual choke engineered for improved street response and reliable tuning.

Built as a two‑piece all‑aluminum unit, this carburetor is calibrated for street performance on small‑block and many big‑block V8s when used with compatible Edelbrock and similar manifolds. Its 600 CFM flow rating, air‑valve secondary design and manual choke make it a common upgrade for engines requiring better throttle response and easy dialing of fuel curves. The 1405 ships with specific metering jets and rods for baseline tuning and offers vacuum provisions for ignition advance.

How does the 1405 improve everyday driving and throttle response?

The air‑valve secondary opens progressively under demand, giving a smoother transition from cruising to wide‑open throttle than fixed secondary designs. The square bore primary and slightly larger secondary bore sizes were chosen to balance low‑end torque and midrange power for street use. The aluminum construction helps keep temperatures down and resists warpage over time.

• 600 CFM total flow for streetable power
• Primary bore 1.44 in, secondary bore 1.69 in for balanced performance
• Air‑valve secondary for controlled, progressive opening
• Two‑piece aluminum body reduces heat soak and distortion

What tuning and vacuum options are included for ignition and fuel setup?

This unit includes both timed and full vacuum ports so you can select the proper source for your ignition advance curve. It ships with metering jets and metering rods sized for a practical street baseline, and the rods are easily swapped for finer tuning. An orange step‑up spring is installed to match the supplied rod curve, and the design avoids fragile plastic parts or power valves that can fail.

• Metering jets: primary .100, secondary .095 for factory baseline
• Metering rods: .070 x .047—interchangeable for tuning
• Step‑up spring: orange (preset for ~5" Hg response)
• Timed and full vacuum ports for ignition advance hookup

What vehicles and manifolds does this carburetor fit, and what should I watch for?

The 1405 is tuned for small‑block and some big‑block engines when paired with Edelbrock Performer, Performer EPS, Performer RPM, RPM Air‑Gap, Torker II and similar dual‑plane manifolds. It accepts late‑model water necks, A/C plumbing, alternator and HEI hardware. Note that it does not have EGR provisions, is not compatible with exhaust‑heated chokes, and will not clear a stock Corvette hood.

• Fits many Edelbrock Performer family manifolds and similar designs
• Accepts electric choke upgrades if you prefer over manual choke
• No EGR or exhaust‑heated choke provisions—verify emissions layout
• May not fit under low‑clearance hoods (e.g., some Corvette applications)

What reliability and service features does the design offer?

Engineered without plastic internal parts or fragile power valves, the Performer 1405 reduces common failure points. There are no gaskets below the fuel bowl level to limit leak sources and the aluminum construction helps maintain dimensional stability. Edelbrock provides replacement/repair coverage for the carburetor itself.

• No plastic internals or blow‑out prone power valves
• No gaskets below fuel bowl level to reduce leaks
• Two‑piece aluminum construction for cooler operation and durability
• Replacement coverage by Edelbrock for the carburetor unit

Who is this for: The Edelbrock 1405 Performer 600 CFM carburetor is intended for street enthusiasts and DIY tuners running small‑block or compatible big‑block V8s who want an easy‑to‑tune, progressive air‑valve secondary carburetor. It’s a solid choice for owners using Edelbrock Performer‑style manifolds who value improved throttle response, straightforward mechanical choke operation, and a robust aluminum build without plastic internals.