Understanding the TA Performance 4000 Series Cam

The TA Performance 4000 Series Cam is engineered for enthusiasts who demand more from their Buick or Pontiac V-8 engine without sacrificing everyday drivability. Unlike a generic replacement cam, this profile is specifically designed to work with the factory cylinder head flow characteristics and intake manifold designs common to these engines. The cam's lobe separation angle and intake centerline are optimized to produce a broad, usable power curve, making it an ideal upgrade for street-driven cars that occasionally see track time.

The 4000 Series cam features a unique asymmetrical lobe design that improves valve acceleration and reduces valvetrain wear compared to older grinds. With a lift ranging from approximately 0.488 in. to 0.510 in. (depending on the specific variant) and duration around 274–284 degrees advertised, this cam increases both intake and exhaust flow efficiency. The resulting overlap helps scavenge exhaust gases at higher RPMs while still maintaining enough manifold vacuum for power brakes and a smooth idle. For those building a stroker motor or adding forced induction, TA Performance also offers custom grinds within the 4000 series to accommodate boost.

It's important to note that the 4000 Series cam is not a "drop-in" for every application. It pairs best with headers, a free-flowing exhaust, and a matched intake system. The cam's aggressive ramp rates mean you should consider upgrading valve springs and retainers to prevent float above 6,000 RPM. A typical factory valvetrain will have sufficient safety margin for the 4000 grind up to about 5,800 RPM, but a mild spring upgrade (e.g., 120–130 lb. on the seat) is highly recommended for long-term reliability.

Power Gains and Performance Expectations

When installed correctly and paired with the proper supporting modifications, the TA Performance 4000 Series Cam delivers measurable improvements. Independent dyno tests using a 455 Buick with 9.5:1 compression, a dual-plane intake, and headers show gains of 22–28 horsepower at peak and 30 lb-ft of torque in the 3,500–5,000 RPM range compared to a stock 350-hp cam. The torque curve becomes significantly flatter, meaning your car pulls harder from a stoplight without needing to wind out every gear.

One of the standout benefits of this cam is its throttle response. The increased intake duration and lift open the valves wider and for a longer period, allowing the engine to breathe more freely at high RPM. However, some low-end torque may be sacrificed compared to a stock cam—typically about 10–15 lb-ft below 2,500 RPM. For most street applications, this trade-off is barely noticeable, especially with a converter stall of 2,400–2800 RPM. If you're running a manual transmission, consider a slightly higher rear gear ratio (e.g., 3.42 or 3.73) to bring the engine into the cam's sweet spot sooner.

The 4000 Series also improves engine sound: you'll get a noticeable lope at idle that announces your build without being obnoxious. The idle quality is still acceptable for daily driving, though you may need to adjust your idle speed slightly (target ~750–800 RPM) to keep the engine stable with accessories like air conditioning active.

Installation Tips

Preparation and Tool List

Before you pull the timing cover, make sure you have the following on hand:

  • Torque wrench (ft-lb and in-lb)
  • Cam bearing installation tool (if replacing bearings)
  • New timing chain set and gears (preferably a heavy-duty double-roller style)
  • Complete gasket set for the front cover and valley pan
  • Assembly lube for the cam lobes and distributor gear
  • Magnetic pickup tool (for dropped bolts)
  • Engine stand or a sturdy jack to support the engine from below

Also, order a new set of lifters (hydraulic flat tappet or roller depending on your block) designed to match the cam's profile. Reusing old lifters with a new cam is a recipe for early failure. If your engine has a distributor, you'll need to re-curve it after installing the cam to optimize ignition timing.

Removing the Original Cam

Start by disconnecting the battery and draining the coolant and oil. Remove the radiator, fan, and any accessories blocking the front cover. On most Buick 400/430/455 engines, you also need to remove the harmonic balancer and the water pump. With the front cover off, note the position of the timing marks on the chain and gears. Rotate the engine by hand until the timing marks are aligned (usually with the number one piston at top dead center). Remove the cam sprocket bolt and slide the chain and sprockets off as a unit. Then carefully pull the cam straight out of the block. If the cam does not slide out easily, check for debris or a misaligned cam bearing.

Once the old cam is out, inspect the cam bearings. If they show scoring or are loose, replace them before installing the new cam. Most 4000 series cams are designed for standard OEM cam bearings, but confirm with your specific part number.

Installing the TA Performance 4000 Series Cam

Apply a generous coat of assembly lube (or a moly paste specifically for camshafts) to every lobe and the distributor drive gear. Insert the cam carefully, rotating it as you go to ensure the lobes don't damage the bearings. When the cam is fully seated, install the cam sprocket finger-tight. Align the timing marks on the chain and gears according to the factory service manual—for most Buick V-8s, this is with the cam sprocket mark at 12 o'clock and the crank sprocket mark at 6 o'clock. Rotate the crankshaft two full revolutions (not using the cam sprocket bolt as leverage) and recheck the marks. If they are off by even a single tooth, your valve timing will be wrong, leading to poor performance or possible piston-to-valve interference.

New lifters must be installed dry without pre-filling (if using hydraulic flat tappets) to allow them to bleed down properly. Dip each lifter in engine oil and place it in its respective bore. Make sure the pushrod end is correctly seated. On hydraulic roller lifts, follow the manufacturer's instructions for preload.

Valvetrain Setup and Adjustment

After the cam and timing chain are in place, install the cylinder heads and valvetrain components. If you upgraded your valve springs, check installed height and seat pressure to ensure they match the cam's requirements. For a 0.500-lift cam, you'll typically want around 130–140 lb. on the seat and 330–350 lb. open. Use a valve spring micrometer to verify.

Set the valve lash according to the cam card. For hydraulic lifters, the common method is to tighten the rocker arm until zero lash is felt, then add an extra half turn (or the value specified by TA Performance). For solid lifters, use feeler gauges and set the clearance when the engine is hot. Many 4000 series cams are offered with a hydraulic flat tappet design, so always confirm which version you have.

Final Assembly and Checks

Install the timing cover using a new gasket (or use RTV on the cover if it's billet). Torque all bolts in a cross pattern to the factory spec (usually 15–20 ft-lb). Reinstall the harmonic balancer and crank pulley. Fill the engine with the correct viscosity oil (10W-30 or 10W-40) and a high-zinc additive for break-in. Prime the oil system by hand cranking with a drill and priming tool until oil flows from all pushrods. Finally, reconnect all accessories, hoses, and electrical connections. Verify there are no coolant or oil leaks before starting the engine.

Supporting Modifications

The TA Performance 4000 Series Cam delivers its best results when matched with the right supporting parts. Here are the key companions:

  • Cylinder heads: Ported factory heads or aftermarket aluminum heads with at least 170–190 cc intake runners will unlock the cam's high-lift potential. The stock heads on a 455 can work, but expect reduced gains due to flow restrictions.
  • Intake manifold: A dual-plane intake like the Edelbrock Performer RPM or the TA Performance Q-Jet manifold keeps the torque curve fat in the low and mid-range. Single-plane intakes will shift power higher but kill street manners.
  • Carburetor or EFI: 750–850 CFM four-barrel carburetor (e.g., Holley or Quadrajet) with vacuum secondary is ideal. For EFI conversions, a 91–95 mm throttle body on a properly tuned ECU works well.
  • Exhaust: 1.75- to 2.0-inch primary headers (full length or shorty) with a 3-inch exhaust system minimize back pressure. The 4000 cam really responds to a free-flowing exhaust.
  • Ignition system: Upgrade to a high-output coil (MSD Blaster or OEM HEI with higher voltage) and set total timing to 34–36 degrees at full advance. This cam needs a little more total timing than a stock cam, typically maxed out by 3,200 RPM.
  • Fuel delivery: Ensure your fuel pump (mechanical or electric) can supply the engine at high RPM. A stock mechanical pump is borderline above 5,500 RPM; consider a high-volume electric pump and regulator.

Tuning and ECU Considerations

For carbureted engines, re-jetting and adjusting the air/fuel mixture is essential after installing the 4000 Series cam. The increased duration and overlap will often lean out the idle circuit. You may need to increase the idle jet size by two to four steps or install an adjustable part-throttle metering block. For later-model engines with computer-controlled carburetors or EFI systems, the oxygen sensor feedback may not be able to correct for the larger cam. A standalone ECU (like the FAST XFI or Holley Terminator) or a chip reflash is recommended for EFI applications. Work with a reputable tuner who has experience with aggressive cam profiles on Buick/Pontiac V-8s.

Break-In Procedure

Once the engine is running, you must break in the camshaft properly—especially if it's a flat tappet design. Follow these steps carefully:

  1. Start the engine and let it idle at 2,000–2,500 RPM immediately. Do not let it idle below 1,500 RPM for the first 20 minutes.
  2. Monitor oil pressure (should be above 40 psi at 2,000 RPM) and listen for any valve clatter or unusual sounds.
  3. Vary the RPM between 2,000 and 3,000 every 30 seconds to help oil splash onto the lobes.
  4. After 20 minutes, shut the engine off and let it cool for 30 minutes.
  5. Re-torque the cylinder head bolts (if using iron heads) and re-check valve lash.
  6. Change the oil and filter, using a high-zinc break-in oil.

For roller cams (if your 4000 series is a roller version), the break-in is less critical, but still avoid prolonged idling for the first hour of operation.

Common Questions

Will this cam work with my stock torque converter?

While it will run, a stock torque converter (1,600–1,800 RPM stall) will make the car feel soft off the line because the cam's power band starts around 2,500 RPM. For best results, upgrade to a converter with a 2,400–2,800 RPM stall.

Do I need to upgrade the timing chain?

Yes, the stock timing chain is usually not robust enough for the increased valve spring pressure and RPM range of the 4000 cam. Use a double-roller timing chain set matched to your engine.

What about piston-to-valve clearance?

If your engine has been decked significantly or uses high-compression piston with big domes, you should check clearance. With a typical 0.030–0.040 in. quench and standard deck height, no issues. But if in doubt, use clay on the piston crown and rotate the engine.

For more technical details and dyno data, consult the official TA Performance camshaft page or popular forums like V8Buick.com discussions and Engine Logix dyno study.

Conclusion

Upgrading to the TA Performance 4000 Series Cam is a proven way to add meaningful horsepower and torque to your Buick or Pontiac V-8. With attention to supporting modifications, proper installation, and break‑in, you can achieve a street‑friendly package that delivers both performance and reliability. Whether you're building a weekend cruiser or a serious bracket racer, this cam profile is a solid foundation for a strong, well‑balanced engine.