How to Install Performance Camshafts: A Step-by-Step Guide

Installing a performance camshaft is a significant upgrade that can unlock more power and a more aggressive engine note for your vehicle. This process requires precision, the right tools, and a solid understanding of engine mechanics. Whether you’re a seasoned DIYer or looking to tackle a more involved automotive project, this guide will walk you through the essential steps involved in successfully swapping your stock camshaft for a performance-oriented one.

We’ll cover everything from initial preparation and part selection to the detailed installation procedure and crucial post-installation checks. Getting this right means a smoother running, more powerful engine; getting it wrong can lead to costly damage.

Simply put, installing a performance camshaft involves carefully disassembling the engine’s valvetrain, removing the old camshaft, installing the new one with precise timing, and reassembling everything correctly, followed by crucial break-in procedures to ensure longevity and optimal performance.

Key Takeaways

• Performance camshaft installation requires meticulous attention to detail in engine timing and assembly.
• Proper preparation, including cleaning and component inspection, is vital before beginning the installation.
• Incorrect cam timing can severely damage engine components, making precise alignment critical.
• Post-installation break-in procedures are essential for the longevity of the new camshaft and associated parts.
• Using high-quality parts and following manufacturer specifications minimizes risks and maximizes gains from your performance camshaft.

What is a Performance Camshaft?

A performance camshaft is an engine component designed to alter the valve timing and duration compared to a stock camshaft. Its primary function is to allow more air and fuel into the cylinders and more exhaust gases out, leading to increased horsepower and torque, particularly at higher RPMs. This is achieved through lobe profiles that lift the valves higher, hold them open longer, and often at different points in the combustion cycle.

The design of a performance camshaft is a complex interplay of lift (how high the valve opens), duration (how long the valve stays open), and lobe separation angle (the angle between the intake and exhaust lobe centers). Each of these parameters is optimized to achieve specific performance characteristics, such as improved top-end power, better low-end torque, or a more aggressive idle sound. Choosing the right camshaft depends heavily on the vehicle’s intended use, existing modifications, and the driver’s preferences.

• Increased Valve Lift: Lifts the valves higher, allowing more air-fuel mixture into the cylinder and exhaust out.
• Extended Valve Duration: Keeps valves open for a longer period, improving volumetric efficiency at higher RPMs.
• Optimized Lobe Separation Angle (LSA): Affects idle quality, torque curve, and overall engine responsiveness. A tighter LSA often leads to a rougher idle and more low-end torque, while a wider LSA can improve high-RPM power and smoother idling.
• Aggressive Lobe Profiles: Designed for faster opening and closing of valves, contributing to better engine breathing.
• Material and Hardening: Often made from stronger materials and hardened for increased durability under higher stress.

When selecting a performance camshaft, consider factors like your vehicle’s intended use (street, track, drag racing), engine displacement, compression ratio, and other modifications like intake, exhaust, and ECU tuning. A camshaft that’s too aggressive for your setup can result in poor idle, vacuum issues, and reduced drivability on the street. Conversely, a mild performance camshaft might not provide the dramatic power gains desired for a dedicated track car.

What You’ll Need for the Installation

Successfully installing a performance camshaft requires a comprehensive toolkit and specific components. Beyond standard mechanic’s tools, specialized items are crucial for precision and safety. Gathering everything beforehand prevents frustrating delays and ensures you can complete the job efficiently.

Always refer to your vehicle’s specific service manual for exact torque specifications and procedures, as they can vary significantly between makes and models.

Safety should always be your top priority. Ensure your vehicle is securely supported on jack stands, and disconnect the battery to prevent accidental starts. If you’re unsure about any step, it’s always best to consult a professional mechanic or seek guidance from experienced enthusiasts.

Essential Tools	Specialty Items	Consumables & Parts
Socket set (metric and SAE)	Torque wrench (ft-lbs and in-lbs)	New camshaft
Wrenches (combination and open-end)	Camshaft degree wheel and dial indicator	New lifters or followers (highly recommended)
Pliers (various types)	Crankshaft pulley holding tool	Timing belt/chain kit (if applicable)
Screwdrivers (flathead and Phillips)	Valve spring compressor (if cylinder head removal is necessary)	New valve cover gaskets
Ratchets and extensions	Crankshaft seal installer	Front timing cover gasket(s)
Oil filter wrench	Piston stop tool	New oil and oil filter
Drain pan	Sealant (RTV or equivalent)	Camshaft bearing lube
Shop rags and cleaner	Camshaft position sensor socket (if applicable)	Break-in oil additive (if recommended)

Beyond the tools, ensure you have the correct new camshaft and any associated parts like lifters, timing components, and gaskets. It’s also wise to have a service manual for your specific vehicle, as it will contain crucial torque specifications and diagrams unique to your engine.

Step-by-Step Camshaft Installation Process

The exact procedure for installing a performance camshaft varies depending on whether your engine is overhead cam (OHC) or pushrod (OHV). This guide provides a general overview. Always consult your vehicle’s service manual for model-specific instructions.

Step 1: Disconnect Battery and Drain Oil

Begin by disconnecting the negative terminal of your vehicle’s battery to prevent electrical shorts. Next, locate the oil drain plug and drain all the old engine oil into a suitable container. This is a good opportunity to inspect the old oil for any signs of metallic debris, which could indicate internal engine issues.

Once drained, reinstall the drain plug with a new crush washer if applicable, torquing it to spec.

Step 2: Access the Camshaft

This is often the most time-consuming part. For OHC engines, this typically involves removing the valve cover(s), and potentially the timing belt or chain cover. For OHV engines, you’ll need to remove the intake manifold, valve covers, and then the timing cover.

1. Remove any components obstructing access to the timing cover and valve covers, such as air intake hoses, accessory belts, and brackets.
2. Carefully unbolt and remove the valve cover(s).
3. For OHC engines, you will need to remove the timing belt or chain. This often involves identifying timing marks on the crankshaft pulley and camshaft sprockets. Use a crankshaft pulley holding tool to prevent the crankshaft from rotating. Mark the belt/chain and sprockets to ensure you can re-time the engine correctly. Loosen the tensioner and carefully remove the timing belt or chain.
4. For OHV engines, after removing the intake manifold and valve covers, you’ll access the pushrods and lifters. You will then need to remove the timing cover.

Step 3: Remove Old Camshaft

With the timing components removed (or loosened and held aside for OHC engines), you can now remove the old camshaft. For OHC engines, this usually means unbolting the camshaft bearing caps in a specific sequence (often from the outside towards the center). Be careful not to damage the camshaft journals or the camshaft itself as you slide it out.

For OHV engines, you’ll typically remove the timing gear/sprocket from the camshaft snout, then carefully pull the camshaft out of its bore.

Important: Keep the lifters or followers in their original order if you are reusing them. Mark them clearly to ensure they go back into the same bore they came out of. Ideally, install new lifters with a new camshaft.

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As you remove the camshaft, pay attention to the condition of the bearing surfaces and the old lifters/followers. Any scoring or excessive wear indicates potential problems that should be addressed before installing the new camshaft.

Step 4: Prepare and Install New Camshaft

Before installing the new performance camshaft, thoroughly clean all bearing surfaces and the camshaft itself. Apply a generous amount of camshaft bearing lube to the camshaft journals and lobes. For new lifters, soak them in proper break-in oil overnight before installation.

If your new camshaft requires it, install new lifters/followers onto the camshaft or into their respective bores.

1. Carefully slide the new camshaft into its bore, ensuring the lobes are oriented correctly and not binding.
2. For OHC engines, reinstall the camshaft bearing caps in the correct sequence and torque them down evenly to the manufacturer’s specifications.
3. For OHV engines, reinstall the camshaft by sliding it into place. Then, install the new timing gear or sprocket onto the camshaft snout and torque it down.

Step 5: Set Camshaft Timing

This is arguably the most critical step. Incorrect timing can cause catastrophic engine damage. You will need to align the crankshaft and camshaft according to the manufacturer’s specifications.

This usually involves using a degree wheel and dial indicator to set the camshaft’s intake lobe center to a precise degree.

1. Rotate the crankshaft to Top Dead Center (TDC) on cylinder #1.
2. Align the timing marks on the crankshaft sprocket and camshaft sprocket (or sprockets) according to the service manual.
3. If using a degree wheel, mount it to the crankshaft and use a dial indicator to find the exact point where the intake valve for cylinder #1 begins to open. Adjust the camshaft’s position until the intake lobe center is at the specified degree (e.g., 108 degrees, 110 degrees, etc.).
4. Reinstall the timing belt or chain, ensuring all marks are aligned and the tensioner is properly set. Double-check all timing marks.

Warning: If you are unsure about setting the timing, especially with an advanced performance camshaft, it is highly recommended to have a professional tuner or mechanic set it up. An incorrect installation here can lead to bent valves or piston-to-valve contact.

Step 6: Reassemble Engine Components

Once the camshaft is installed and timed, you can begin reassembling the engine. This involves reversing the disassembly process.

• Install new valve cover gaskets and reinstall the valve covers.
• For OHV engines, reinstall the intake manifold with a new gasket.
• Reinstall any brackets, sensors, and accessories that were removed.
• Ensure all electrical connectors are reattached securely.

Before reinstalling the timing cover (if removed), apply a thin bead of RTV sealant to the mating surfaces as specified by the manufacturer. Reinstall the timing cover and torque bolts to spec.

Step 7: Refill Oil and Start Engine

Fill the engine with the correct type and amount of new engine oil. It’s often recommended to use a break-in oil or add a break-in additive, especially with new flat-tappet camshafts, to ensure proper initial lubrication of the lobes and lifters.

1. Prime the oil system if possible (some engines have a port for this). This helps ensure oil reaches critical components immediately on startup.
2. Double-check all fluid levels and connections.
3. Reconnect the battery.
4. Crank the engine. It may take a few seconds longer than usual for the oil pressure to build.
5. Once the engine starts, immediately check for any unusual noises or warning lights.

Step 8: Camshaft Break-In Procedure

This is a critical step for the longevity of your new performance camshaft, especially for flat-tappet designs. The break-in period allows the camshaft lobes and lifters to properly mate and wear in, preventing premature failure.

• For flat-tappet camshafts: The engine must be run at 2,000-2,500 RPM continuously for 20-30 minutes immediately after starting. Do NOT let the engine idle during this period. This ensures adequate oil flow to the critical mating surfaces. Monitor oil pressure and temperature closely.
• For roller camshafts: While not as critical as flat-tappets, it’s still good practice to avoid prolonged idling and gentle driving for the first few hundred miles.

After the initial break-in period, you can gradually return to normal driving conditions. It’s recommended to change the oil and filter after the first 50-100 miles to remove any fine wear particles generated during the break-in.

Tip: If your engine has a mechanical fuel pump and you are using a camshaft with a larger base circle or a roller cam, you may need to adjust or replace the fuel pump pushrod to ensure proper fuel pump operation.

Common Mistakes to Avoid

Installing a performance camshaft is a complex job, and a few common missteps can lead to significant issues. Being aware of these pitfalls can help you avoid costly repairs and ensure your upgrade performs as expected. Precision and careful attention to detail are paramount throughout the entire process.

Mistake	Consequence	How to Avoid
Incorrect Cam Timing	Catastrophic engine damage (bent valves, piston-to-valve contact)	Double and triple-check all timing marks before and after installing the belt/chain. Use a degree wheel if necessary.
Skipping the Break-In Procedure	Premature camshaft lobe and lifter wear, leading to failure	Follow the manufacturer’s break-in procedure meticulously, especially for flat-tappet cams. Maintain consistent RPMs.
Reusing Old Lifters/Followers	Accelerated wear on new cam lobes, possible cam failure	Always install new lifters or followers with a new camshaft for optimal performance and longevity.
Improper Torqueing of Bearing Caps	Camshaft binding, bearing damage, or catastrophic failure	Use a calibrated torque wrench and follow the manufacturer’s specified torque sequence and values precisely.
Not Using Camshaft Lube	Dry starts leading to immediate lobe damage	Apply liberal amounts of high-quality camshaft bearing lube to journals and lobes before installation.
Failing to Inspect Other Components	New camshaft failure due to worn timing chain, oil pump, or valve springs	Inspect the timing chain/belt, oil pump, valve springs, and cylinder head for any signs of wear or damage. Replace as necessary.

Frequently Asked Questions

What is the difference between a hydraulic and a solid lifter camshaft?

Hydraulic lifters use oil pressure to maintain zero valve lash automatically, resulting in a quieter operation and generally smoother idle. Solid lifters require periodic adjustment to maintain precise valve lash, which can lead to more precise valve control at high RPMs and potentially more power, but also requires more maintenance and can be noisier.

Can I install a performance camshaft without changing anything else?

While you can install a performance camshaft as a standalone modification, optimal results and reliability are achieved when other components are matched. This includes intake, exhaust systems, and ECU tuning. A camshaft that’s too aggressive for a stock engine may not perform optimally and could even cause drivability issues.

How long does it take to install a performance camshaft?

The installation time can vary significantly depending on your mechanical skill level, the specific vehicle, and whether the cylinder heads need to be removed. For an experienced mechanic, it might take 4-8 hours. For a DIYer, it could range from 8-16 hours or even longer if encountering unexpected issues.

What are the signs of a failing camshaft?

Symptoms of a failing camshaft can include a rough idle, loss of engine power, misfires, increased fuel consumption, ticking or knocking noises from the engine, and a general decline in engine performance. If you notice any of these, it’s crucial to have your engine inspected promptly.

Should I replace my valve springs when installing a new camshaft?

Yes, it is highly recommended to replace valve springs when installing a performance camshaft. Performance camshafts often have higher lift and duration, which requires stiffer valve springs to prevent valve float at higher RPMs. Using stock springs with a performance cam can lead to valve float, misfires, and potential engine damage.

Consult your camshaft manufacturer’s recommendations.

Final Thoughts

Installing a performance camshaft is a rewarding project that can significantly boost your engine’s power and character. Remember that precision in timing, proper lubrication, and adhering to the break-in procedure are paramount for its longevity. By following this comprehensive guide and consulting your vehicle’s specific service manual, you can confidently tackle this upgrade and enjoy the enhanced performance it brings to your driving experience.