This aluminum dual-plane intake manifold is designed for compatible 1969–1997 Ford Small Block Windsor 351W/5.8L V8 engine applications. Its long-runner dual-plane configuration, square-bore four-barrel carburetor flange, and idle-to-6,800 RPM operating range make it suitable for street and performance engine builds.
The manifold features a satin cast-aluminum body, eight rectangular intake ports, a rear water crossover, additional coolant ports, and cast-in nitrous bosses. A compatible aftermarket distributor is required because the stock distributor does not provide the necessary clearance.
Product Highlights
- Designed for Ford Small Block Windsor 351W/5.8L V8 engines
- Compatible with applicable 1969–1997 351W engine configurations
- Long-runner dual-plane intake design
- Operating range from idle to 6,800 RPM
- Designed for one square-bore four-barrel carburetor
- 5.12-inch manifold height
- Lightweight cast-aluminum construction
- Satin aluminum finish
- Eight rectangular intake-runner ports
- Rear water crossover with additional coolant ports
- Cast-in bosses for an optional nitrous-system installation
- No EGR provision
Fitment and Compatibility
Engine Compatibility
This intake manifold is intended for Ford Small Block Windsor 351W engines with a 5.8L or 351-cubic-inch displacement. The applicable engine family was used from 1969 through 1997, but the vehicle model year alone does not confirm fitment.
- Ford Small Block Windsor 351W V8
- 5.8L / 351-cubic-inch displacement
- Compatible Windsor-style cylinder heads
- OEM standard-deck 351W block configuration
- Applicable 1969–1997 engine configurations
Confirm the installed engine, cylinder heads, intake-port arrangement, manifold bolt pattern, gasket type, distributor clearance, and available engine-bay space before ordering.
Not Directly Compatible With
- Ford 221 Small Block Windsor
- Ford 260 Small Block Windsor
- Ford 289 Small Block Windsor
- Ford 302/5.0L Small Block Windsor
- Ford Boss 302
- Ford 351 Cleveland
- Ford 351M
- Ford 400
The 351W has a taller and wider block configuration than the 221, 260, 289, and 302 Windsor engines, so their standard intake manifolds are not directly interchangeable. The 351 Cleveland, 351M, and 400 use different cylinder-head, intake-port, and coolant-passage configurations.
Important Fitment Information
- A compatible aftermarket distributor is required. The stock distributor does not fit with this manifold.
- Large-base distributors may also have clearance limitations and should be measured before installation.
- For 1974 and earlier 351W engines, use the correct 16-bolt intake gasket and confirm port and coolant-passage alignment.
- Later applications may use a different intake bolt and gasket configuration.
- Aftermarket cylinder heads may have different port dimensions, raised ports, or modified bolt locations.
- Check carburetor, air-cleaner, throttle-linkage, fuel-line, distributor, and hood clearance.
- This manifold does not include an EGR provision.
Performance and Design
Long-Runner Dual-Plane Design
The long-runner dual-plane layout separates the intake paths to support airflow across a broad engine-speed range. It is intended to provide useful street response while continuing to support airflow at higher RPM.
The listed operating range is from idle to 6,800 RPM. Actual engine performance depends on the complete combination, including the cylinder heads, camshaft, carburetor, compression ratio, ignition system, exhaust, gearing, and tuning.
Carburetor Selection
The manifold is designed for one four-barrel carburetor using a square-bore mounting pattern. Carburetor size should be selected according to engine displacement, target RPM, cylinder-head airflow, camshaft, vehicle weight, gearing, and intended use.
- Street applications commonly use a 600–750 CFM vacuum-secondary or double-pumper carburetor.
- Competition-oriented combinations may use a 750–850 CFM double-pumper carburetor.
These ranges are general recommendations. The correct carburetor depends on the complete engine combination and should be confirmed by the engine builder or tuner.
Rear Water Crossover
The manifold includes a rear water crossover with additional coolant ports. This provides flexibility for compatible cooling-system layouts, temperature sensors, heater connections, or block-off fittings.
Unused ports must be sealed with suitable plugs or fittings. Confirm the required coolant routing before installation.
Nitrous Bosses
Cast-in bosses are provided for compatible custom nitrous-system installations. The bosses may require drilling, tapping, and additional hardware before use.
Nitrous-system components are not included. Any machining and system installation should be completed by a qualified engine builder or installer.
Product Specifications
| Product Type |
Carbureted intake manifold |
| Compatible Engine Family |
Ford Small Block Windsor |
| Compatible Engine |
351W / 5.8L V8 |
| Applicable Engine Years |
1969–1997 |
| Cylinder-Head Type |
Compatible Windsor-style cylinder heads |
| Engine Block Style |
OEM standard deck |
| Intake Design |
Long-runner dual-plane |
| Carburetor Quantity |
One |
| Carburetor Flange |
Square-bore four-barrel |
| Operating Range |
Idle–6,800 RPM |
| Manifold Height |
5.12 inches |
| Material |
Cast aluminum |
| Finish |
Satin aluminum |
| Intake Runners |
Eight |
| Intake-Port Shape |
Rectangular |
| Rear Water Crossover |
Yes |
| Additional Coolant Ports |
Yes |
| Nitrous Bosses |
Yes; machining may be required |
| EGR Provision |
No |
| Stock Distributor Compatible |
No |
| Installation Instructions Included |
No |
| Quantity |
One intake manifold |
Construction and Package Contents
Construction Details
The manifold uses a cast-aluminum body with a satin finish and machined cylinder-head sealing surfaces. The square-bore carburetor pad has a four-bolt mounting pattern surrounding two rectangular plenum openings.
The underside includes eight rectangular intake-runner ports and a rear coolant passage. Threaded coolant ports and cast-in nitrous bosses are positioned around the manifold body for compatible custom installations.
What Is Included
- One cast-aluminum dual-plane intake manifold
Carburetor, intake gaskets, carburetor gasket, distributor, mounting hardware, fittings, fuel-system components, throttle linkage, air cleaner, sensors, nitrous-system components, and other installation parts are not listed as included.
Emissions Compliance Notice
This intake manifold does not include an EGR provision. Before installation or road use, confirm that the product and resulting engine configuration comply with all applicable federal, state, and local emissions requirements. Do not remove or disable emissions-control equipment required for the vehicle.
This Product Is Best Suited For
This intake manifold is best suited for street and performance Ford 351W/5.8L Windsor builds using compatible cylinder heads, an OEM standard-deck block configuration, a square-bore four-barrel carburetor, and a compatible aftermarket distributor.
- 1969–1997 Ford 351W/5.8L engine applications
- Street-performance engines requiring a broad operating range
- Engine combinations intended to operate from idle to approximately 6,800 RPM
- 351W builds using a performance-oriented street camshaft
- Applications requiring a long-runner dual-plane intake design
- Custom cooling-system layouts that can use a rear water crossover and additional coolant ports
- Engine builds that may use the cast-in bosses for a professionally installed nitrous system
This manifold is not suitable for buyers who need to retain a stock distributor or an original EGR-equipped intake configuration. It should also not be selected as a direct replacement for a 302/5.0L, 351C, 351M, or 400 intake manifold.
Frequently Asked Questions
Which engine is this intake manifold designed for?
It is designed for compatible 1969–1997 Ford Small Block Windsor 351W/5.8L V8 engine applications. Confirm the installed engine, cylinder heads, intake ports, gasket type, and surrounding clearance before ordering.
Does it fit a Ford 302 or 5.0L Windsor engine?
No. Although the 302 and 351W belong to the Windsor engine family, the 351W has a taller and wider block configuration. Their standard intake manifolds are not directly interchangeable.
Does it fit a Ford 351 Cleveland?
No. The 351 Cleveland uses a different cylinder-head, intake-port, and coolant-passage configuration.
Can I use the stock distributor?
No. The stock distributor does not provide the required clearance with this manifold. A compatible aftermarket distributor is required. Check the distributor-body diameter and surrounding clearance before installation.
What intake gasket is required?
The correct gasket depends on the engine year and cylinder heads. For 1974 and earlier 351W engines, use the applicable 16-bolt intake gasket. Always compare the gasket with the cylinder-head ports, manifold ports, bolt holes, and coolant passages before installation.
What type of carburetor does it use?
The manifold is designed for one four-barrel carburetor using a square-bore mounting pattern.
What carburetor size is recommended?
A 600–750 CFM carburetor is commonly used for street combinations. Competition-oriented builds may use a 750–850 CFM carburetor. The correct size depends on the complete engine combination and intended use.
What is the operating range?
The listed operating range is from idle to 6,800 RPM. Actual performance depends on the cylinder heads, camshaft, carburetor, ignition, exhaust, compression ratio, gearing, and tuning.
Does the manifold include a rear water crossover?
Yes. It includes a rear water crossover and additional coolant ports for compatible cooling-system configurations.
Are the nitrous bosses ready to use?
The manifold includes cast-in bosses for an optional nitrous installation. Drilling, tapping, and additional system components may be required. Professional installation is recommended.
Are intake gaskets included?
No. Intake gaskets are not listed as included and must be selected for the installed engine and cylinder heads.
Is this intake manifold emissions legal for street use?
This manifold does not include an EGR provision and is not represented as emissions legal for every vehicle or jurisdiction. Compliance depends on the vehicle, engine configuration, original emissions equipment, registration location, and intended use. Check applicable federal, state, and local requirements before installation.
Installation
Before Installation
- Confirm that the engine is a Ford Small Block Windsor 351W/5.8L V8.
- Verify that the cylinder heads use a compatible Windsor intake-port and bolt configuration.
- Determine whether the engine requires a 12-bolt or early 16-bolt intake gasket.
- Compare the manifold ports, gasket openings, bolt holes, and coolant passages before installation.
- Prepare the correct intake gaskets, carburetor gasket, sealant, mounting hardware, plugs, and fittings.
- Obtain the correct intake-manifold tightening sequence and torque specifications for the engine and cylinder heads.
- Prepare a compatible aftermarket distributor and verify its body clearance.
- Check carburetor, throttle-linkage, fuel-line, air-cleaner, and hood clearance.
- Allow the engine to cool completely, disconnect the battery, and relieve fuel-system pressure.
- Drain coolant as required before removing the existing intake manifold.
- Label vacuum lines, wiring, fuel connections, and coolant hoses before disassembly.
Brief Installation Steps
- Disconnect the battery and allow the engine to cool completely.
- Relieve fuel-system pressure and drain coolant as required.
- Remove the air cleaner, carburetor, fuel connections, throttle linkage, vacuum lines, hoses, distributor, and other components that block access to the manifold.
- Remove the existing intake manifold according to the applicable engine service procedure.
- Cover the exposed intake ports and carefully clean the cylinder-head mating surfaces without allowing debris to enter the engine.
- Test-fit the new manifold and check port alignment, bolt-hole alignment, coolant passages, distributor clearance, carburetor position, and hood clearance.
- Install the correct intake gaskets. Apply suitable RTV or sealant around the coolant ports and other specified sealing areas according to the gasket and engine requirements.
- Lower the manifold into position without disturbing the gaskets, then start all mounting bolts by hand.
- Tighten the bolts in the correct sequence and to the specifications provided for the engine and cylinder heads.
- Install the compatible aftermarket distributor, carburetor, throttle linkage, fuel lines, vacuum connections, coolant hoses, fittings, and other removed components.
- Refill any drained fluids, reconnect the battery, and check throttle operation before starting the engine.
- Start the engine and inspect for fuel, coolant, oil, and vacuum leaks. Verify ignition timing, idle operation, carburetor adjustment, and cooling-system operation.
These steps provide a general installation overview. Exact gasket selection, sealant requirements, bolt sequence, torque specifications, distributor setup, and carburetor adjustment depend on the engine, cylinder heads, and vehicle configuration. Installation instructions are not included with the product, so professional installation is recommended.
PLEASE NOTE!
