BBC 396-454 Dual Plane Intake Manifold & 4-Barrel Carburetor Kit 750 CFM | Mechanical Secondary

---!@!start!@!---Specifications---!@!end!@!--- EVIL ENERGY Chevy Big Block Dual Plane Intake Manifold Brand EVIL ENERGY Part Number 3001 Product Name Chevy Big Block Dual Plane Carburetor Intake Manifold Application Focus Big Block Chevy intake manifold for compatible BBC 396, 402, 427, and 454 carburetor builds Intake Category Dual plane intake manifold / carburetor intake manifold / carb intake manifold Manifold Type Standard Dual Plane Intake Manifold Fuel System Compatibility Carburetor Intake Style Original-style intake / modified elbow and dual plane street torque layout RPM Range 2,500 - 4,500 RPM Material Cast Aluminum Color / Variant Silver / Black Compatible Engine Family Chevy Big Block 1965-2000 BBC 396, 402, 427, and 454 V8 engines Compatible Displacements 396 cid, 402 cid, 427 cid, and 454 cid Big Block Chevrolet applications Engine Platform Focus BBC intake manifold applications for compatible 396, 402, 427, and 454 Big Block Chevy carbureted engines Fitment Note This product is intended for compatible Big Block Chevrolet applications and should not be assumed to fit Small Block Chevy, GM LS, or unrelated engine families. Compatible Vehicles Chevrolet Camaro SS / RS First Gen (1967-1969, 396 / 402 applications) Chevrolet Impala SS Second Gen (1965-1970, 396 / 402 applications) Chevrolet Chevelle SS396 (1965-1972, 396 / 402 applications) Chevrolet El Camino SS396 (1968-1972, 396 / 402 applications) Chevrolet Corvette C2 / C3 (1966-1969, 427 applications) Chevrolet Camaro First Gen COPO 9561 (427 special-order applications) Chevrolet Impala / Chevelle SS427 (1966-1969, 427 applications) Chevrolet Heavy-Duty Trucks (select 427 big-torque applications) Chevrolet Corvette C3 (1970-1974, 454 LS5 / LS6 applications) Chevrolet Camaro Second Gen (1970-1972, 454 applications) Chevrolet Monte Carlo First Gen (1970-1972, 454 applications) Chevrolet Impala / Caprice Full-size (1970-1976, 454 applications) Chevrolet El Camino (1970-1975, 454 applications) Chevrolet / GMC C/K Heavy-Duty Pickup and Suburban (1973-1995, 454 applications) Chevrolet Step-Van and Commercial Platforms (select 454 applications) Dimensions 22.48 in (L) x 10.64 in (W) x 5.53 in (H) / 570.98 mm x 270.26 mm x 140.49 mm Best Use Street muscle cars, heavy-duty towing builds, cruising applications, and low-to-mid RPM Big Block Chevy torque upgrades EVIL ENERGY 750 CFM 4-Barrel Carburetor Mechanical Secondary Brand EVIL ENERGY Material Aluminum Barrels 4 CFM 750 Carburetor Flange Square bore Choke Type Electric Secondary Throttle Type Mechanica Fuel Inlet Dual Calibration Main Jets:#74 Secondary Jets:#80 Accelerator Pump Nozzle:0.031 inch Power Valve :6.5Hg Venturi Diameter Primary Venturi Diameter: 1.38 inch Secondary Venturi Diameter: 1.38 inch Throttle Bore Diameter 1.6875 inch Carburetor Height 3.25 inch Compatibility GM, Ford, Chrysler AT Shift Linkage Assemblies Condition New ---!@!start!@!---Description---!@!end!@!--- BBC 396-454 Dual Plane Intake Manifold & 750 CFM Mechanical Secondary Carburetor Kit Matching a carburetor to a Big Block Chevy involves more than choosing the largest available CFM rating. This EVIL ENERGY combination pairs a dual plane intake manifold for compatible BBC 396, 402, 427, and 454 V8 engines with a 750 CFM carburetor using mechanical secondaries, electric choke, and dual fuel inlets. It is intended for naturally aspirated street and street-performance combinations where usable low-to-mid RPM response and direct secondary throttle operation are both priorities. The intake manifold is designed around a 2,500-4,500 RPM operating range, while the mechanical-secondary carburetor responds directly to throttle movement. This pairing is better suited to engines with sufficient displacement, airflow, gearing, and supporting modifications than to a mild combination that spends most of its time under light throttle. Before ordering: Confirm the actual Big Block Chevy engine and cylinder heads, carburetor mounting interface, required airflow, fuel pressure, dual-feed fuel plumbing, throttle and transmission linkage, electric choke wiring, air cleaner height, and hood clearance. Is This Intake & Carburetor Kit Right for Your BBC? Engine / Build What to Know Before Ordering Compatible BBC 396 / 402 / 427 / 454 Compatible engine family when the cylinder heads, intake interface, fuel system, linkage, and clearance are verified. 427 / 454 street-performance build A strong application candidate when the engine has sufficient airflow demand and the intended RPM range matches the dual plane intake. Modified 396 / 402 Verify carburetor sizing. Camshaft, cylinder heads, compression, RPM, gearing, and vehicle use determine whether 750 CFM is appropriate. Stock or mildly modified BBC A 750 CFM mechanical-secondary carburetor may be more aggressive than necessary for some combinations. Performance street / hot rod Better aligned with the direct secondary response of the mechanical-secondary carburetor. Low-speed cruising-focused build A less aggressive carburetor configuration may provide characteristics better matched to the intended use. Small Block Chevy / LS / unrelated engine family Not compatible. This intake manifold is designed around compatible Big Block Chevrolet applications. Is a 750 CFM Carburetor Right for Your Big Block Chevy? A 750 CFM carburetor should be matched to the actual airflow demand of the engine rather than selected from displacement alone. Engine size, maximum RPM, volumetric efficiency, camshaft profile, cylinder-head airflow, compression ratio, exhaust, gearing, vehicle weight, and intended use all affect carburetor sizing. For many properly configured 427 and 454 performance combinations, 750 CFM can be a practical starting point. Modified 396 and 402 engines may also use this airflow level when the complete engine combination supports it. A stock or lightly modified engine operating primarily at lower RPM may not require the same airflow or secondary response. The same applies when selecting a 454 big block carburetor: engine displacement is only one part of the calculation. A larger carburetor does not automatically improve throttle response or overall drivability when airflow demand is lower than the carburetor's available capacity. Mechanical Secondaries: What They Mean for the Build The included carburetor uses mechanical secondaries, so secondary throttle opening is linked directly to throttle movement. This creates a more immediate secondary response than an air valve- or vacuum-controlled arrangement when the throttle is opened aggressively. That response can work well in performance-oriented applications, but it also places greater importance on correct carburetor sizing, accelerator-pump calibration, gearing, engine airflow, and throttle technique. A mechanical-secondary carburetor should therefore be selected as part of the complete engine and vehicle combination rather than from CFM alone. The electric choke provides cold-start enrichment when properly wired and adjusted. Choke operation should be verified during initial setup along with idle speed, idle mixture, accelerator-pump response, and throttle linkage. Why Pair It with a Dual Plane Intake? The dual plane intake manifold is designed to maintain air velocity and carburetor signal through the low-to-mid RPM range. This gives the combination a different operating character from a high-RPM single plane intake. The manifold's listed 2,500-4,500 RPM range makes the combination primarily relevant to street and street-performance BBC builds where usable torque and throttle response matter. The mechanical-secondary carburetor adds a more direct response under larger throttle inputs without changing the manifold's intended operating range. The manifold RPM range is an intake-system specification, not a guarantee of engine performance. Actual operating characteristics depend on displacement, cylinder heads, camshaft, compression, exhaust, ignition, fuel delivery, transmission, gearing, and vehicle load. Big Block Chevy Engine Fitment This intake manifold and carburetor combination is intended for compatible carbureted 1965-2000 Chevrolet Big Block 396, 402, 427, and 454 V8 engine applications. Reference applications may include Camaro, Chevelle, Impala, El Camino, Corvette, Monte Carlo, Caprice, Chevrolet and GMC C/K trucks, Suburban, Step-Van, and other vehicles equipped with a compatible Big Block Chevrolet engine. Vehicle year, make, and model alone do not confirm fitment. Classic vehicles frequently have engine swaps, aftermarket cylinder heads, transmission changes, intake conversions, and other modifications. Confirm the engine and cylinder-head configuration actually installed before ordering. This kit should not be assumed to fit Small Block Chevy, GM LS, Ford, Mopar, or unrelated engine families. What Else Should Be Checked Before Installation? The manifold and carburetor are only part of the complete induction and fuel system. The following interfaces should be verified before installation: System What to Verify Cylinder Heads Confirm intake-port alignment, intake bolt pattern, and the correct intake manifold gasket. Carburetor Mounting Confirm the mounting pattern, carburetor gasket, mounting hardware, and whether a spacer or adapter is required. Fuel Delivery Verify carburetor fuel pressure, fuel filter, line size, routing, fittings, and the plumbing required for the dual fuel inlets. Throttle & Transmission Linkage Check throttle cable bracket, return springs, full throttle travel, and transmission linkage requirements. Electric Choke Confirm the correct electrical connection and choke adjustment before operation. Vacuum / PCV Identify PCV, brake-booster, distributor vacuum, and other required vacuum connections and seal unused ports. Air Cleaner & Hood Clearance Check the complete installed height of the manifold, carburetor, gasket, any spacer or adapter, and the air cleaner. Package Contents BBC Dual Plane Intake Manifold x 1 EVIL ENERGY dual plane intake manifold for compatible BBC 396, 402, 427, and 454 V8 applications. 750 CFM 4-Barrel Carburetor x 1 EVIL ENERGY square-bore carburetor with mechanical secondaries, electric choke, and dual fuel inlets. Intake Manifold Installation Hardware x 1 Set Includes the supplied manifold mounting hardware and installation accessories. Additional Parts to Check Before Ordering The exact installation parts depend on the engine and vehicle configuration. Check whether the build requires: Intake manifold gasket set Carburetor base gasket Carburetor studs or mounting hardware Dual-feed fuel line or suitable fuel fittings Fuel pressure regulator if required by the fuel-system configuration Fuel filter and suitable fuel hose or hard line Throttle cable bracket and return springs Transmission kickdown or TV cable components where applicable Vacuum and PCV fittings Air cleaner assembly Carburetor spacer or adapter if required Before Installation Confirm the engine: Verify a compatible Chevrolet Big Block 396, 402, 427, or 454 V8. Verify the cylinder heads: Check intake-port alignment, bolt pattern, and gasket compatibility. Check the carburetor interface: Confirm the mounting pattern, gasket, hardware, and spacer or adapter requirements. Check the fuel system: Verify fuel pressure, fuel line size, filter, dual-inlet fittings, and routing before connecting the carburetor. Check throttle travel: Verify throttle linkage, return springs, and transmission linkage through the full range of motion. Wire the electric choke correctly: Confirm the electrical connection and full choke movement. Identify vacuum connections: Confirm PCV, brake-booster, distributor, and accessory vacuum requirements. Check total installed height: Include the intake manifold, carburetor, any spacer or adapter, and air cleaner when checking hood clearance. Initial Setup & Carburetor Tuning Do not begin by changing jets simply because the engine runs rich, lean, hesitates, or idles poorly. Verify the basic installation and supporting systems before changing carburetor calibration. Inspect the intake manifold, carburetor base, vacuum ports, and fuel connections for leaks. Verify fuel pressure and fuel delivery before startup. Confirm ignition timing and ignition-system operation. Check throttle linkage and verify that the primary and secondary throttles move correctly. Verify accelerator-pump operation before evaluating throttle response. Confirm electric choke operation during cold start and warm-up. Set idle speed and idle mixture after the engine reaches normal operating temperature. Evaluate acceleration and secondary operation before making jetting or accelerator-pump changes. Change one calibration variable at a time and record the result. Vacuum leaks, incorrect fuel pressure, restricted fuel delivery, float or needle-seat problems, accelerator-pump adjustment, ignition faults, and timing errors can produce symptoms that resemble incorrect carburetor calibration. EVIL ENERGY Carburetor Support Learn more about carburetor selection, installation, and tuning through the EVIL ENERGY Carburetor Collection . Installation Guide: How to Install a Carburetor Step-by-Step Guide How Carburetors Work: How Does a Carburetor Work? Can the Right One Boost Your Performance?