The Edelbrock 1406 Carburetor is a widely used performance component in automotive applications. Designed for enhanced engine performance and efficiency, this carburetor must be installed and maintained with precision to ensure optimal functionality. Installation requires attention to compatibility, torque specifications, and sealing procedures, all of which are emphasized in official documentation provided by Edelbrock.
This article provides a detailed breakdown of the installation process, focusing on technical instructions, compatibility considerations, and common issues that may arise during setup. All information is derived exclusively from official installation guides, technical notes, and manufacturer FAQ materials.
Overview of the Edelbrock 1406 Carburetor
The Edelbrock 1406 Carburetor is part of the Performer Series, which is designed for street performance and off-road use. It is not calibrated for or compatible with alcohol race fuel or E85 pump fuel, as stated in the installation documentation. This restriction is critical for users who may otherwise attempt to use alternative fuel sources without proper calibration.
Users are also advised that improper installation may void the warranty and lead to poor performance. Therefore, it is essential to follow the manufacturer’s guidelines closely and, if unsure, to seek assistance from a qualified mechanic.
Pre-Installation Considerations
Before installing the Edelbrock 1406 Carburetor, several key considerations must be addressed:
Compatibility and Fuel Type
As mentioned in the installation manual, the carburetor is not intended for use with alcohol-based or high-octane fuels such as E85. This is an important limitation for users who may be running modified engines or experimenting with alternative fuel types. The carburetor is optimized for standard gasoline and must not be used without recalibration or modifications that could compromise engine performance or safety.
Use of Qualified Mechanics
The documentation explicitly states that if the installer does not feel confident in performing the installation, they should consult a qualified mechanic. This is a standard precaution in technical installation guides and is included to ensure that the user does not inadvertently damage the component or the engine.
Torque Specifications and Sequence
Proper torque application is essential for ensuring a secure and leak-free installation. Users are instructed to follow Edelbrock’s recommended torque specs and sequence, which can be found in the manufacturer’s Tech Center. This step is particularly important for the intake manifold and related fittings, which must be tightened to the correct specifications to prevent leaks and maintain performance.
Installation Steps
The installation process for the Edelbrock 1406 Carburetor involves several key steps, each of which must be executed with care to avoid damage to the component or the engine.
Step 1: Preparation and Component Inspection
Prior to installation, the user should inspect the intake manifold and the carburetor for any signs of wear or damage. The intake manifold must be clean and free of debris. The manufacturer recommends using lacquer thinner to clean both the block and manifold surfaces to ensure a proper seal.
If the intake manifold has an oil sending unit located on the end seal surface, it is important to check for leaks at the point where the unit threads into the block. A thread sealant should be applied to this area to prevent oil leaks.
Step 2: Sealing the End Seal
Edelbrock explicitly states that cork or rubber end seals are not recommended for use with their intake manifolds. Instead, the manufacturer recommends applying a ¼” bead of silicone in place of these materials. This method provides a more reliable and durable seal compared to traditional cork or rubber end seals.
The silicone must be applied to both the block and manifold surfaces, and it is important to allow the silicone to cure overnight before starting the engine. This ensures that the seal is fully set and will not fail during operation.
Step 3: Installing Fittings
The installation of NPT (National Pipe Thread) fittings into the intake manifold requires special care. The manufacturer advises against the use of a torque wrench for these fittings, as over-tightening can cause damage to the aluminum manifold.
Instead, users should apply Teflon tape or paste to the first few threads of the NPT fitting before installation. The fitting should then be tightened by hand using a box-end wrench and a couple of fingers to snug it up. Over-tightening is discouraged due to the tapered nature of the NPT threads and the risk of cracking the manifold.
Step 4: Clearances and Spacers
Some Edelbrock intake manifolds require the use of a #2732 spacer to maintain proper clearance with the hood and other components. Users can test for clearance by placing clay or foil balls on the air cleaner and gently closing the hood. If resistance is felt, the user should stop to avoid damage. After opening the hood, the compressed material can be measured to determine if additional clearance is needed.
Additionally, if the stock engine uses a bypass to the intake manifold, it is recommended to install it onto the Edelbrock intake as well. Failure to do so may result in the engine running hot due to improper airflow or fuel distribution.
Step 5: Installation of the Carburetor
The Edelbrock 1406 Carburetor is mounted onto the intake manifold using a series of bolts. The manufacturer does not recommend the use of a carburetor lift plate for installation, as the intake manifolds are made of aluminum and the 5/16” carb flange holes are not Heli-coiled. Instead, the carburetor should be carefully positioned and bolted in place using the recommended torque specifications.
Once the carburetor is installed, the air cleaner and associated components can be added. The manufacturer also recommends using a flow test tool, such as the Edelbrock #76506, to ensure that the fuel pressure is sufficient during operation. This tool helps verify that the system is properly calibrated and that there are no blockages or restrictions in the fuel line.
Common Installation Issues and Troubleshooting
Several issues may arise during or after the installation of the Edelbrock 1406 Carburetor. Recognizing and addressing these problems early can prevent further damage and ensure optimal performance.
End Seal Leaks
One of the most common issues reported is an end seal leak. This typically occurs when the seal between the intake manifold and the engine block is not properly formed. As previously mentioned, the use of cork or rubber end seals is not recommended. Instead, a ¼” bead of silicone should be applied to the mating surfaces and allowed to cure.
If a leak persists after installation, the intake manifold must be removed and inspected. The surfaces should be cleaned again with lacquer thinner and re-sealed with fresh silicone. The manifold should then be reinstalled and allowed to cure before the engine is started.
NPT Fitting Issues
NPT fittings are often a source of leaks or damage during installation. If over-tightened, the aluminum manifold can crack, leading to costly repairs. To avoid this, users should follow the manufacturer’s instructions for applying Teflon tape or paste and tightening the fittings by hand.
Additionally, users should avoid using a torque wrench on NPT fittings, as this can lead to over-tightening and potential damage. Instead, the fittings should be installed using a box-end wrench and a few fingers to snug them up without applying excessive force.
Fuel Pressure and Flow Testing
To ensure that the fuel system is properly calibrated, users should perform a flow test using the Edelbrock #76506 flow test tool. This tool allows the user to measure the fuel pressure and flow rate under operating conditions. By comparing the results to the manufacturer’s specifications, the user can determine if the system is properly calibrated or if adjustments are needed.
The flow test involves attaching the tool to the fuel pressure regulator and using a braided fuel line to connect it to a fuel container or the vehicle’s fuel cell. The user can then monitor the fuel pressure as it flows through the system and adjust the regulator accordingly.
Post-Installation Recommendations
After the Edelbrock 1406 Carburetor has been installed, there are several additional steps that users should take to ensure long-term performance and reliability.
Lifter Preload Adjustments
If the user has installed a camshaft and lifter kit from Edelbrock, it is important to set the correct lifter preload. The manufacturer provides specific recommendations for different models:
- Performer Plus Camshaft and Lifter Kits: Lifter preload should be ½ turn past 0 lash.
- Torker Plus Camshaft and Lifter Kits: Lifter preload should be ¼ turn past 0 lash.
- Performer RPM Camshaft and Lifter Kits: Lifter preload should be ¼ turn past 0 lash (7106 should be ½ turn).
- Rollin’ Thunder Camshaft and Lifter Kits: Lifter preload should be ¾ to 1 full turn past 0 lash.
These settings ensure that the valves operate correctly and that the engine runs smoothly without excessive wear or noise.
Oil and Additive Recommendations
When using flat tappet cams, the manufacturer recommends an oil or additive with a zinc-enhanced formula. Edelbrock offers its own High Performance Zinc Additive (#1074), which is designed to protect against wear and extend engine life. This additive is particularly beneficial for vehicles that are not driven frequently or for cold starts, where the risk of metal-to-metal contact is higher.
One bottle of the additive is sufficient to treat up to 6 quarts/liters of oil. Users should follow the manufacturer’s instructions for mixing and application to ensure that the additive is effective.
Maintenance and Long-Term Care
To maintain the performance of the Edelbrock 1406 Carburetor, users should follow a regular maintenance schedule. This includes checking for leaks, inspecting the intake manifold and carburetor for wear, and ensuring that all fittings are properly tightened.
Users should also keep the air cleaner and air filter in good condition, as these components play a key role in maintaining engine performance and preventing debris from entering the carburetor.
In addition, users should periodically check the fuel pressure and flow using the flow test tool. This can help identify potential issues before they become serious and ensure that the engine is operating at peak efficiency.
Conclusion
The Edelbrock 1406 Carburetor is a high-performance component that requires careful installation and maintenance to ensure optimal performance. Users must follow the manufacturer’s guidelines closely, including the use of proper sealing materials, torque specifications, and recommended tools.
By addressing common installation issues such as end seal leaks, NPT fitting problems, and fuel pressure concerns, users can avoid costly repairs and extend the life of their engines. Additionally, following the recommended maintenance schedule and using the appropriate additives can help ensure long-term reliability and performance.
For users who are unsure about any aspect of the installation process, it is strongly recommended to consult a qualified mechanic or contact Edelbrock’s Factory Tech Line at 800-999-0853 for assistance.