Understanding the Pontiac 455 and Camshaft Basics

The Pontiac 455, produced from 1970 to 1976, is one of the most iconic big-block engines in American automotive history. Its 7.5-liter displacement, combined with a robust bottom end and massive torque potential, makes it a favorite among muscle car enthusiasts and restomodders. While the 455’s stock camshafts were designed for emissions compliance and smooth idle, aftermarket cams like those from Crower unlock the engine’s true performance capabilities.

The camshaft controls when the intake and exhaust valves open and close. Key specifications include duration (how long the valve stays open), lift (how far it opens), and lobe separation angle (LSA). By altering these parameters, a performance camshaft changes where the engine makes power, often shifting the torque curve upward and increasing peak horsepower.

The Role of the Camshaft in the Pontiac 455

In a Pontiac 455, the factory camshaft typically had around .400″ lift and 273° advertised duration, producing roughly 350 horsepower in high-compression versions. Swapping to a Crower performance cam increases lift to .480″–.560″ and duration to 290°–310°, allowing more air and fuel into the cylinders. This directly translates to a significant horsepower increase, provided the rest of the engine can handle the additional airflow. The Pontiac’s large-displacement nature means even a modest cam upgrade yields noticeable gains.

Crower Camshaft Options for the Pontiac 455

Crower offers several camshaft grinds specifically designed for the Pontiac 455. Each profile targets different power bands and uses. Below are popular options with real-world results.

  • Crower 60230 (Hydraulic Flat Tappet): .480″ intake / .480″ exhaust lift, 280° advertised duration, 112° LSA. This is a mild upgrade ideal for stock heads and a factory intake. Gains 30–50 hp.
  • Crower 60231 (Hydraulic Flat Tappet): .510″ / .520″ lift, 290° duration, 110° LSA. A more aggressive street-strip cam that works best with ported heads and a dual-plane intake. Gains 60–80 hp.
  • Crower 60233 (Hydraulic Roller): .560″ / .560″ lift, 306° duration, 108° LSA. For serious performance builds with aftermarket heads and a single-plane intake. Gains 90–120 hp.
  • Crower 60234 (Solid Flat Tappet): .540″ / .540″ lift, 310° duration, 106° LSA. Requires stout valvetrain and high-rpm use. Gains 100–130 hp in race applications.

For a street-driven Pontiac 455, the hydraulic roller profiles offer the best balance of power gains and reliability.

Horsepower Gains: Real World Dyno Results

Dyno tests confirm that a Crower camshaft can add between 20 and 130 horsepower depending on the cam choice, engine condition, and supporting modifications. To give you a clear picture, here are documented results from enthusiasts and shops.

Gains with Stock Configuration

With unmodified heads, a stock intake manifold, and a factory carburetor, a Crower 60230 cam installed on a Pontiac 455 dynoed at 385 horsepower at 4,800 rpm. The same engine with the factory cam made 340 horsepower. That’s a 45 hp gain with only the cam change. Torque also increased from 480 lb-ft to 520 lb-ft at 3,200 rpm. The engine retained a mild idle suitable for daily driving.

Gains with Supporting Mods

When paired with ported #96 cylinder heads, an Edelbrock Performer RPM intake, and a 750 cfm carburetor, a Crower 60231 cam produced 473 horsepower at 5,500 rpm and 560 lb-ft of torque at 4,000 rpm. That’s a 95 hp gain over a stock long-block with just a mild cam. In a build using stroker pistons and Crower 60233 hydraulic roller cam, dyno results exceeded 550 horsepower with 600+ lb-ft of torque.

The key takeaway: a Crower cam alone adds 30–50 hp; with proper cylinder heads, intake, and exhaust, gains can exceed 100 hp. The engine builder’s tuning plays a major role in maximizing output.

Cost Analysis: Camshaft and Supporting Parts

Installing a Crower camshaft is not just the cost of the cam itself. To achieve reliable performance, several related components often need replacement. Below is a detailed cost breakdown for a typical Pontiac 455 cam upgrade.

Crower Camshaft Pricing

  • Basic hydraulic flat tappet (60230): $350–$450
  • Performance hydraulic flat tappet (60231): $450–$600
  • Hydraulic roller (60233): $800–$1,100 (includes roller cam and lifter kit)
  • Solid flat tappet (60234): $500–$700

It is recommended to purchase a cam kit that includes lifters, springs, and pushrods priced between $900 and $1,500 for complete valvetrain upgrades.

  • Valve springs: Stock springs cannot handle .520″ lift or high rpm. New dual springs with dampeners cost $150–$300.
  • Pushrods: Hardened pushrods for Pontiacs are needed to prevent flex. Price: $100–$200.
  • Timing chain set: A rollmaster or Cloyes double-roller set is essential for accurate cam timing. Cost: $80–$150.
  • Lifters: If not included in a kit, lifters for flat tappet cams cost $100–$200. Hydraulic roller lifters can be $400–$600.
  • Gaskets and seals: $50–$100 for a full gasket set.
  • Carburetor or EFI tuning: May require jetting changes or a new carburetor ($200–$600).
  • Distributor recurve: Proper advance curve tuning adds $100–$200 if not done DIY.

Installation Labor Costs

Professional installation for a cam swap on a Pontiac 455 typically ranges from $800 to $1,500 depending on the shop’s hourly rate and the complexity of the job (removal of accessories, pullies, timing cover, etc.). A do-it-yourself installation can save labor costs but requires mechanical skill, a torque wrench, and about 8–12 hours of work.

Total budget for a Crower cam upgrade with supporting parts and professional installation: $2,000–$4,000 for a high-performance setup. A basic mild cam swap on stock heads can be done for around $1,500 if you do the work yourself.

Installation Considerations and Tuning

Choosing the Right Cam

Selecting the correct Crower cam depends on your driving style and vehicle purpose. For a street-driven Pontiac 455 with stock heads and manual or automatic transmission, a hydraulic flat tappet with around .480″ lift and 280° duration provides a noticeable power increase without losing drivability. For a weekend warrior or strip car, a hydraulic roller with .560″ lift and 306° duration works best with aftermarket heads and a high-stall torque converter.

It’s critical to check piston-to-valve clearance when using large cams. Pontiac 455s have ample piston reliefs, but cams with over .560″ lift often require fly-cutting the pistons. Always test clearance during assembly.

Tuning for Maximum Gains

After installing the cam, the engine must be properly tuned to realize the full horsepower potential. Key tuning steps include:

  • Carburetor re-jetting: A cam with more overlap increases the signal to the carburetor at low rpm, often requiring smaller primary jets and larger secondary jets.
  • Distributor mechanical and vacuum advance: Many Pontiacs need a lighter distributor spring set (like a B28 kit) to bring in total advance earlier. Initial timing should be set at 12°–16° BTDC with total advance around 34°–36°.
  • Idle speed and mixture: Larger cams often require idle speed increased to 800–1,000 rpm and a richer mixture at idle to prevent stalling.
  • Temperature management: Aggressive cams may increase underhood heat; a high-flow water pump and electric fan help maintain coolant temperature.

If using fuel injection, the ECU will need a custom tune by a professional tuner. Many owners prefer a stand-alone EFI system for better drivability with large cams.

Expected Results and Driving Experience

After installing a Crower camshaft, Pontiac 455 owners consistently report more immediate throttle response, a deeper exhaust note, and stronger acceleration from 2,500 to 5,500 rpm. With a mild cam, the car cruises well on the highway and still starts easily. With a hotter cam, the idle becomes choppy (a “lumpy” sound) and low-rpm vacuum drops, which may require a vacuum canister for power brakes.

Owners note that the large-displacement Pontiac 455 can handle camshafts that would make a small-block barely drivable. The engine’s broad torque curve compensates for reduced low-end power from aggressive cam timing. For example, a Crower 60233 cam in a 455 produces enough torque at 1,800 rpm to pull a heavy car, while the same cam in a 400 cubic inch Pontiac would feel sluggish below 2,500 rpm.

Long-term reliability with a Crower cam is excellent when using adequate oil, break-in procedure (especially for flat tappet cams), and regular maintenance. Crower’s materials and manufacturing are among the best in the aftermarket.

Conclusion

Adding a Crower camshaft to your Pontiac 455 is one of the most cost-effective ways to gain significant horsepower and improve overall performance. Expect gains between 20 and 100+ horsepower depending on the cam selection and supporting modifications. While the total cost for a cam swap with parts and labor ranges from $1,500 to $4,000, the return in driving excitement and power output is well worth the investment for any enthusiast.

For a street-driven vehicle, aim for a hydraulic flat tappet or roller cam with lift around .500″ and duration in the 280°–290° range. Pair it with a good intake, headers, and a proper tune, and you will unlock the Pontiac 455’s true potential.

For more detailed specifications and dyno sheets, visit Crower’s official Pontiac camshaft page. For community discussions and builds, check out Pontiac Street Performance and Performance Years Forums. For ordering parts, suppliers like Summit Racing carry Crower cams and supporting components.