Why Your Nashville Muscle Car Needs a Catch Can

If you own a high-performance muscle car in Nashville—whether it’s a late-model Chevrolet SS, a Dodge Challenger, a Ford Mustang GT, or a restored classic—you know that keeping the engine clean and breathing freely is key to power and reliability. A catch can is one of the most cost-effective upgrades you can make. It captures oil vapors and blow-by gases that would otherwise recirculate into the intake, coating the valves, intercooler, and combustion chambers with sludge. Over time, that carbon buildup robs horsepower, reduces fuel economy, and can lead to costly repairs.

This guide walks you through a professional-quality installation from start to finish. Whether you’re working in a home garage or a shop in Nashville’s humid summer heat, these steps ensure your catch can works as intended. We’ll cover the tools you need, the critical placement decisions, hose routing, and the small details that make the difference between a leak-free installation and a headache. Let’s get started.

Understanding the Role of a Catch Can in High-Performance Engines

Before diving into the installation, it helps to understand exactly what a catch can does and why it’s especially valuable for muscle cars driven in Nashville’s varied climate—from hot, humid summers to chilly winter mornings.

How Engine Blow-By Causes Damage

In any internal combustion engine, a small amount of combustion gases leak past the piston rings into the crankcase. This is called blow-by. These gases contain unburned fuel, moisture, and oil vapor. The PCV (Positive Crankcase Ventilation) system is designed to route these gases back into the intake manifold to be re-burned. However, on direct-injection engines—found in many modern muscle cars—the intake valves never get washed by fuel, so any oil vapor that reaches them bakes into hard carbon deposits. A catch can intercepts the oil and moisture before it reaches the intake, allowing clean air to pass through.

Why Muscle Cars Are Prime Candidates

Muscle cars typically produce more blow-by than commuter cars due to higher cylinder pressures, larger displacement, and forced induction (in supercharged or turbocharged models). Aggressive cam profiles also increase crankcase pressure. The result: more oil vapor being pushed into the intake, faster carbon buildup, and a greater need for a reliable separation system. Installing a catch can is one of the simplest ways to keep that power plant running cleanly.

Tools and Materials

Having everything ready before you start saves repeated trips to the hardware store. Here’s a complete list of what you’ll need:

  • Catch can kit – Choose a quality unit with a replaceable filter or a baffled internal design. Brands like Mishimoto, JLT, or Moroso are popular for muscle car applications.
  • Socket and ratchet set – Metric and SAE sizes. A 10mm and 13mm socket are common for PCV valve removal and bracket bolts.
  • Screwdrivers – Both flat-head and Phillips for hose clamp adjustments.
  • Hose clamps – Stainless steel worm-gear clamps (the kit may include these, but having extras the right size is wise).
  • Hose cutter or sharp scissors – For trimming the supplied PCV hose to exact lengths.
  • Rags or shop towels – Blow-by fluid is oily and sticky.
  • Protective gloves and safety glasses – Oil, coolant, and hot surfaces are all hazards.
  • Disposable oil drain pan – To catch any fluid that drips when disconnecting hoses.
  • Masking tape and marker – For labeling hoses if your system has multiple ports.

Optional but helpful: a pick tool for removing stubborn hose clamps, a flashlight, and a small mirror for checking tight spots.

Preparation and Safety

Safety is straightforward but critical. Perform the installation on a cold engine—ideally one that hasn’t been run for at least two hours. Hot exhaust manifolds and coolant hoses can cause burns. Also, disconnect the negative battery terminal to avoid any accidental electrical shorts while working near sensors or the alternator.

Park the car on a level surface, engage the parking brake, and chock the rear wheels. If you need to raise the vehicle for access, use jack stands—never rely solely on a floor jack.

Take a moment to clean the area around the PCV valve and intake ports. Dirt or debris that falls into an open hose can score bearings or clog passages. A quick wipe with a damp rag is enough.

Step-by-Step Installation

Step 1: Locate the PCV Valve and Intake Hose

Open the hood and find the PCV valve. On most muscle car engines—whether it’s an LS/LT series, Hemi, or Coyote—the PCV valve is mounted in the valve cover or near the intake manifold. It looks like a small valve with a rubber grommet and a hose attached. The other end of that hose connects to the intake tube, usually after the mass air flow sensor. Refer to your vehicle’s service manual for exact location if needed.

Also identify any additional crankcase vent lines. Some engines have two: one from each valve cover. For a basic single-catch-can setup, you’ll intercept the main PCV line. For dual systems, you may install two cans or a single larger can with dual inlets.

Step 2: Remove the Existing PCV Hose

Using a screwdriver, loosen the hose clamps at both ends of the PCV hose. Slide the clamps back along the hose to free them. Gently twist and pull the hose off the PCV valve and the intake tube fitting. Be prepared for a small amount of oil to drip out—have a rag or drain pan underneath.

If the hose is brittle or cracked, consider replacing it with new hose of the same inner diameter. Many catch can kits include a length of hose, but if not, standard 3/8” or 1/2” PCV hose works for most applications. Keep the original hose as a pattern for routing.

Step 3: Mount the Catch Can

Choosing the right mounting location is critical. The catch can should be mounted vertically (or at least within 45 degrees of vertical) so that condensed oil drains to the bottom. It must be secure and not interfere with the hood, fan, or moving belts. Common locations:

  • On the inner fender panel (strut tower bracket)
  • On the firewall using pre-existing studs
  • On a custom bracket attached to the intake manifold bolts

Hold the can in position and mark the mounting holes. Drill pilot holes if needed (use a center punch to keep the bit from walking). Attach the can with bolts, nuts, or self-tapping screws. Ensure it’s tight—engine vibration will loosen a poorly mounted can over time, leading to rattles and potential hose disconnection.

Step 4: Cut and Route the Hoses

Measure the distance from the PCV valve to the catch can inlet. Cut a piece of hose to that length using a sharp cutter for a clean, square end. Repeat for the outlet side (catch can to intake manifold). It’s better to cut a little long and trim again than to cut too short.

Route hoses away from sharp edges, exhaust components, and hot engine surfaces. If the hose must pass near a hot pipe, use a heat-sleeve or loom to protect it. Make sure there are no kinks or tight bends that could restrict flow.

Step 5: Connect the Hoses and Secure Clamps

Slide a hose clamp over each end of the hose before pushing the hose onto the fitting. Push the hose fully onto the barbed fitting until it bottoms out. Then slide the clamp over the barb and tighten it with a screwdriver. Do not overtighten—just snug. Overtightening can crack plastic fittings or distort rubber hoses, causing future leaks.

Double-check that the inlet hose (from PCV valve) connects to the inlet port of the catch can and the outlet hose goes to the intake manifold. Swapping them will render the can ineffective or may cause pressure issues. Most cans are clearly marked “IN” and “OUT.”

Step 6: Final Checks and Initial Startup

Before you reconnect the battery, walk through every connection:

  • Are all hose clamps tight?
  • Is the can securely mounted?
  • Are hoses routed away from moving parts and hot surfaces?
  • Did you leave enough slack for engine movement (especially if the can is mounted on the body and the PCV valve is on the engine)?

Reconnect the negative battery terminal. Start the engine and let it idle. Listen for any vacuum leaks—hissing sounds. Check all connection points for oil seepage. Rev the engine a few times and recheck. If everything is dry and quiet, take the car for a short test drive. After driving, shut it off and inspect again.

Post-Installation Testing and Monitoring

Over the first few hundred miles, check the catch can’s drain plug or reservoir level. You may be surprised at how much oil accumulates, especially during cold starts and spirited driving. A properly installed catch can will collect a mixture of oil and water vapor. That’s exactly what it’s supposed to do.

Take note of any changes in idle quality or drivability. If the engine runs rough, you may have a vacuum leak at the hose connections. Check the clamps and ensure the PCV valve is still functioning. Also verify that the catch can is not too restrictive—some cheap cans have internal baffles that clog quickly. High-quality units maintain proper flow.

Maintenance for Long-Term Performance

A catch can is not a set-it-and-forget-it device. Regular maintenance is essential to keep the system effective:

  • Empty the can every 2,000–4,000 miles or when it becomes half-full. Dumping oil vapors back into the intake defeats the purpose.
  • Inspect hoses and clamps every oil change. Heat and vibration can loosen clamps or cause hoses to crack.
  • Clean the can’s internal baffle or filter element if it has a replaceable one. Some cans have a mesh that can be washed with solvent and re-oiled (for filter type) or simply replaced.
  • Check the PCV valve function periodically. A failing PCV valve can cause rough idle, oil leaks, or excessive pressure. Replace it per the manufacturer’s schedule.

For Nashville drivers, especially during the humid summer, the can may collect more moisture. That’s normal, but be thorough when draining to prevent rust inside the can.

Common Questions and Troubleshooting

My catch can is collecting very little oil. Is it working?

It could be normal if your engine has low blow-by or if you have a very efficient PCV system. But also check that you installed the hoses in the correct direction. The inlet port should come from the PCV valve; the outlet goes to the intake. If they’re reversed, air will bypass the can’s internal baffle, and oil won’t be separated. Also verify that the can is mounted vertically; laying it on its side greatly reduces efficiency.

The engine is idling rough after installation. What’s wrong?

This is usually a vacuum leak. Check all hose connections for tightness. A common mistake is leaving a small gap at a barbed fitting or not using a clamp on a hose that slipped off partially. Also inspect the catch can itself—some units have a small vent screw that must be closed; others have a drain plug that may be loose.

Do I need a catch can if I already have an oil separator or an air/oil separator?

Some factory systems (like those on certain performance models) already incorporate a crude oil separator, but they are rarely as effective as an aftermarket catch can designed specifically for high blow-by engines. The factory separator is often a small chamber inside the intake or valve cover. A dedicated catch can with internal baffling or a coalescing filter will separate much more oil.

Can I install two catch cans?

Yes, especially on engines with dual valve covers or forced induction setups that have heavy blow-by. One can can be dedicated to the PCV side, another to the fresh air vent side. This is common on highly modified muscle cars.

Conclusion

Installing a catch can on your Nashville muscle car is a simple, low-cost project that pays dividends in engine cleanliness and longevity. By following this step-by-step guide, you’ve taken a proactive step to protect your investment. Keep an eye on the can during routine checks, empty it when needed, and enjoy the peace of mind that your intake valves and combustion chambers are staying free of harmful carbon deposits.

For further reading, check out Mishimoto’s engineering explanation of catch can operation. If you run into any specific vehicle fitment questions, JLT’s installation resources for Mustangs and Challengers are excellent. For a deeper dive into PCV system theory, this Super Chevy article covers the basics. And if you’re looking for a top-quality catch can for your specific muscle car, American Muscle’s catch can selection is a reliable source.