WEIAND 3698 Tunnel Intake 4V

( Brand: Weiand ), ( Mounting Style: Bolt-on ), ( Color: Polished Aluminum ), ( Manufacturer Part Number: 3698 ), ( Material: Aluminum ), ( Vintage Part: Yes ), ( Fuel Type: Gasoline ), ( California Prop 65 Warning: Not For Street Use In Most States ), ( Type: Intake Manifold ), ( Oe/oem Part Number: 5994 ), ( Engine Size: 351c 4v ), ( Features: Polished ), ( Country/region Of Manufacture: United States )

Review WEIAND 4v Polished Tunnel Intake fits RAM 351C 2X4

The WEIAND 3698 351C 4V Tunnel Ram Intake is a high-performance intake manifold designed for Ford 351 Cleveland engines. This intake manifold is specifically engineered to provide superior airflow and fuel delivery for enhanced power and torque.

The 3698 351C 4V Tunnel Ram Intake features a unique tunnel ram design, which is characterized by a large, central intake runner that feeds air directly into the throttle bodies. This design reduces the length and volume of the runners, minimizing the amount of air that needs to be pushed through them, and allowing for increased airflow and velocity.

The intake manifold is constructed from high-strength aluminum alloy, ensuring durability and reliability under the demands of high-performance applications. The surface of the intake manifold is finished with a polished coating, giving it a sleek and attractive appearance.

The 3698 351C 4V Tunnel Ram Intake is designed to work with Ford 351 Cleveland engines equipped with 4-barrel carburetors. It comes with factory-style bosses for easy installation, allowing you to use your original factory-installed carburetor mounting hardware.

This intake manifold is also compatible with various fuel systems, including mechanical and electronic fuel injection systems. It comes with fuel rails and fuel injector mounting bosses, allowing you to easily adapt it to your specific fuel system.

The 3698 351C 4V Tunnel Ram Intake is a direct replacement for the stock intake manifold, making it a straightforward upgrade for Ford 351 Cleveland engine enthusiasts looking to boost power and torque. Its unique tunnel ram design, combined with its high-quality construction and versatile compatibility, makes it an excellent choice for those seeking to maximize the performance potential of their engine.

Buying a WEIAND 3698 351C 4V Tunnel Ram Intake for your Oldsmobile engine comes with several pros and cons that you should consider before making a decision.

1. Increased Airflow: Tunnel rams are known for their ability to increase airflow into the engine. The WEIAND 3698 intake is designed to provide a significant boost in airflow, which can lead to increased horsepower and better engine performance.

2. Improved Engine Sound: Tunnel rams can also provide a unique and distinct engine sound that some enthusiasts find appealing. The intake design can create a louder and more aggressive exhaust note, which can be a desirable feature for some.

3. Better Fuel Economy: While not a primary benefit, some users have reported improved fuel economy with the use of a tunnel ram intake. The increased airflow can lead to more complete combustion, which can result in better fuel efficiency.

1. Complex Installation: Installing a tunnel ram intake can be a complex and time-consuming process. The intake design requires the use of a tunnel ram manifold and a custom air cleaner assembly, which can add to the installation time and cost.

2. Potential for Vacuum Leaks: Tunnel ram intakes can be prone to vacuum leaks. The complex intake design can create areas where vacuum leaks can occur, which can lead to poor engine performance and hard starting.

3. Increased Cost: Tunnel ram intakes are generally more expensive than traditional intake systems. The WEIAND 3698 351C 4V Tunnel Ram Intake is no exception, and the cost of the intake, as well as the installation, can be a significant investment.

The WEIAND 3698 351C 4V Tunnel Ram Intake offers several benefits, including increased airflow, improved engine sound, and potential fuel economy improvements. However, the complex installation process, potential for vacuum leaks, and increased cost are significant drawbacks. Ultimately, whether or not this intake is right for you depends on your personal preferences, budget, and the specific requirements of your Oldsmobile engine. If you are an enthusiast looking for maximum performance and a unique engine sound, then this intake may be worth the investment. However, if you are looking for a more straightforward and cost-effective solution, then a traditional intake system may be a better choice.

If you are considering purchasing the WEIAND 3698 351C 4V Tunnel Ram Intake, I would recommend doing your research and weighing the pros and cons carefully. Be prepared for a complex installation process and the potential for vacuum leaks. However, if you are committed to the idea of a tunnel ram intake and are willing to invest in the time and money required, then this intake could be a great addition to your Oldsmobile engine. Alternatively, if you are looking for a more cost-effective and straightforward solution, then a traditional intake system may be a better choice. Ultimately, the decision is yours, and I hope this information helps you make an informed decision.

Details:

Perfect intake for race or show quality car. Part numbers include: PN:3698, PN:1916, PN: 5994, and Pat Number:3561408. All bolt holes are good. No cracks, welds, or breaks.

Extremely nice early but polished Weiand aluminum intake.

part #: 3698 prices

• $1200.00-$1280.00

specifications inputmanifolds:

• for models: 351c, 2x4, Ram
• brand: Weiand
• mounting style: Bolt-on
• color: Polished Aluminum
• manufacturer part number: 3698
• material: Aluminum
• vintage part: Yes
• fuel type: Gasoline
• california prop 65 warning: Not For Street Use In Most States
• type: Intake Manifold
• oe/oem part number: 5994
• engine size: 351c 4v
• features: Polished
• country/region of manufacture: United States

returns inputmanifolds:

• policy: No Returns

offer inputmanifolds:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: July 25, 2025
• best offers: True

payments inputmanifolds:

• credit card: Discover
• other
• wallet: Google-pay

seller inputmanifolds:

• city: Taylors, South Carolina
• rating: 100.0%
• # reviews: 11

general inputmanifolds:

• Car Truck Parts Accessories > Air Fuel Delivery > Intake Manifolds
• condition: Used

shipping inputmanifolds:

• transit: 4-10 Days
• carrier: UPS
• class: Standard
• cost: $200.00
• type: Fixed
• service: UPS Ground

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