How to replace the air filter on a 1970 Plymouth Hemi 'Cuda?

Replacing the air filter on a 1970 Plymouth Hemi 'Cuda is an essential maintenance task that ensures your high-performance engine runs efficiently and stays protected from debris. Over time, air filters can become clogged with dirt and dust, which restricts airflow and affects engine performance. You might notice a drop in horsepower, reduced fuel efficiency, or even experience the engine running roughly. To keep your classic 'Cuda in top shape, follow these steps to replace the air filter.

Step 1: Park and Prepare Your Vehicle
First, make sure your vehicle is parked on a flat, level surface and the engine is cool. Open the hood by releasing the hood latch located under the dashboard on the driver’s side. Once the hood is open, use the hood prop rod to keep it securely in place.

Step 2: Locate the Air Cleaner Assembly
In the engine bay, find the air cleaner assembly. It is a large, round metal housing sitting on top of the engine, directly over the carburetors. The air cleaner assembly typically has a chrome or black finish with the recognizable “426 Hemi” or “Hemi” insignia engraved on it.

Step 3: Remove the Wing Nut and Air Cleaner Cover
Using your hand, unscrew the wing nut located at the center of the air cleaner cover. This nut secures the cover in place. Be careful not to drop it into the engine bay. Once the wing nut is removed, lift off the air cleaner cover and set it aside. You may also need to disconnect the breather hose attached to the side of the air cleaner assembly, depending on your specific setup.

Step 4: Remove the Old Air Filter
With the cover removed, you will see the air filter element sitting inside the air cleaner base. The filter is usually a circular paper or foam element. Lift the old air filter out of the housing and dispose of it properly. Take note of any dirt or debris inside the air cleaner base and clean it with a clean, dry cloth if necessary.

Step 5: Install the New Air Filter
Take your new air filter and place it into the air cleaner base. Ensure that it fits snugly and is seated properly. The new filter should have the same dimensions and shape as the old one.

Step 6: Reattach the Air Cleaner Cover
Place the air cleaner cover back on top of the new filter. Make sure it is aligned correctly with the housing. Screw the wing nut back onto the stud in the center of the cover to secure it. If you had to disconnect any hoses before, reattach them now. Double-check that everything is firmly in place.

Step 7: Close the Hood and Finish Up
Finally, remove the hood prop rod and carefully close the hood. Start the engine to make sure everything is functioning correctly and to listen for any unusual sounds that might indicate an improperly seated air filter.

By following these steps, you can ensure that your 1970 Plymouth Hemi 'Cuda remains in excellent running condition, with a fresh air filter allowing your legendary Hemi engine to breathe properly.