Camshaft and Exhaust Combo: Achieving 600 Hp on a Pontiac 455 — Costs and Installation Tips

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The Pontiac 455 is a classic engine known for its power and performance. Achieving 600 horsepower from this beast requires careful selection of components, particularly the camshaft and exhaust system. In this article, we will explore the best camshaft and exhaust combinations, along with costs and installation tips to help you reach that impressive horsepower goal.

Understanding the Pontiac 455 Engine

The Pontiac 455, produced from 1970 to 1976, is a part of the Pontiac V8 family. With a displacement of 455 cubic inches, this engine is known for its torque and potential for high horsepower when properly modified. To achieve 600 hp, modifications are necessary, focusing on the camshaft and exhaust system.

Choosing the Right Camshaft

The camshaft plays a critical role in determining the performance characteristics of your engine. When selecting a camshaft for your Pontiac 455, consider the following:

  • Lift and Duration: Higher lift and longer duration can increase airflow, which is crucial for achieving higher horsepower.
  • Type of Cam: Hydraulic flat tappet, hydraulic roller, and solid roller cams each have their advantages. Hydraulic roller cams are often preferred for their reliability and performance.
  • RPM Range: Choose a camshaft that matches your desired RPM range for peak power.

Here are some popular camshaft options for achieving 600 hp on a Pontiac 455:

  • Comp Cams Xtreme Energy 274H: This cam features a lift of .480/.480 and a duration of 224/230 at .050″.
  • Howards Cams 110141-12: With a lift of .600/.600 and a duration of 240/246, this cam is designed for high performance.
  • Lunati Voodoo 60203: This cam offers a lift of .507/.507 and a duration of 231/239, ideal for street and strip applications.

Exhaust System Selection

The exhaust system is equally important in maximizing horsepower. A free-flowing exhaust allows for better expulsion of exhaust gases, which can significantly improve performance. Consider the following when choosing an exhaust system:

  • Header Type: Long-tube headers are typically better for performance than shorty headers, as they offer improved scavenging.
  • Exhaust Diameter: A larger diameter exhaust pipe reduces back pressure, which is beneficial for high horsepower builds.
  • Material: Stainless steel is more durable and resists corrosion compared to mild steel, though it comes at a higher cost.

Here are some exhaust system options that work well with the Pontiac 455:

  • Hooker Super Competition Headers: These long-tube headers provide excellent flow and fit well with Pontiac engines.
  • Flowmaster American Thunder Cat-Back: This system enhances sound and performance, featuring a 2.5-inch diameter.
  • Dynomax Ultra Flo Welded Mufflers: Known for their high flow and low restriction, these mufflers are great for performance builds.

Cost Breakdown

Understanding the costs associated with achieving 600 hp on a Pontiac 455 is essential for budgeting your project. Below is a breakdown of estimated costs:

  • Camshaft: $300 – $800 depending on the brand and type.
  • Headers: $400 – $1,200 for quality long-tube headers.
  • Exhaust System: $300 – $1,000 for a full cat-back system.
  • Installation Costs: $500 – $1,500 if hiring a professional.
  • Total Estimated Cost: $2,000 – $4,500 depending on choices made.

Installation Tips

Proper installation of your camshaft and exhaust system is crucial for optimal performance. Here are some tips to ensure a successful installation:

  • Follow Manufacturer Instructions: Always refer to the installation manual provided with your components.
  • Use Quality Gaskets: Invest in high-quality gaskets to prevent leaks.
  • Check Clearances: Ensure that all components fit properly and there are no clearance issues.
  • Torque Specifications: Use a torque wrench to tighten bolts to manufacturer specifications.
  • Break-in Period: Follow the recommended break-in procedure for the camshaft to ensure longevity.

Conclusion

Achieving 600 horsepower on a Pontiac 455 is an exciting project that requires careful planning and execution. By selecting the right camshaft and exhaust components, understanding the associated costs, and following proper installation practices, you can unlock the full potential of your engine. Whether you’re a seasoned mechanic or a beginner, the journey to high horsepower can be rewarding and educational.