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The 1970 Pontiac 400 is a classic muscle car that has captured the hearts of automotive enthusiasts for decades. With its powerful engine and sleek design, it is a prime example of American muscle. In this article, we will explore the real-world performance gains achieved by installing a Comp Cams XE268 camshaft in the Pontiac 400, resulting in an impressive increase of 80 horsepower.
Understanding the Pontiac 400 Engine
The Pontiac 400 engine was first introduced in 1967 and quickly became known for its robust performance and reliability. It features a cast-iron block and a bore and stroke of 4.12 inches by 3.75 inches, which allows for a displacement of 400 cubic inches. The engine was designed to deliver substantial torque and power, making it a popular choice for muscle car enthusiasts.
What is the Comp Cams XE268 Camshaft?
The Comp Cams XE268 camshaft is part of Comp Cams’ Xtreme Energy line, which is known for producing high-performance camshafts that enhance engine performance across a broad RPM range. The XE268 cam features:
- Duration: 224 degrees intake / 234 degrees exhaust
- Lift: .510 inches intake / .520 inches exhaust
- Lobe separation angle: 110 degrees
This camshaft is designed to provide a significant boost in horsepower and torque, making it an ideal upgrade for the Pontiac 400 engine.
Installation Process
Installing the Comp Cams XE268 camshaft in a 1970 Pontiac 400 requires careful attention to detail. Here are the key steps involved in the installation process:
- Remove the existing intake manifold and cylinder heads.
- Replace the camshaft, ensuring proper alignment with the timing chain.
- Install new lifters and check for proper clearance.
- Reassemble the engine, including the intake manifold and cylinder heads.
- Adjust the valve lash according to the manufacturer’s specifications.
It is recommended to have a professional mechanic perform the installation if you are not experienced with engine modifications.
Performance Gains
After installing the Comp Cams XE268 camshaft, the real-world results were impressive. The Pontiac 400 experienced an increase of 80 horsepower, bringing the total output to approximately 400 horsepower. This gain can be attributed to several factors:
- Improved airflow due to the camshaft’s design.
- Increased lift and duration allowing for better fuel mixture intake.
- Enhanced throttle response and overall engine efficiency.
These performance gains make the Pontiac 400 with the Comp Cams XE268 camshaft a formidable contender on the road and at the track.
Real-World Testing
To validate the performance improvements, real-world testing was conducted on a dynamometer. The results showcased a significant increase in horsepower and torque across the RPM range. The testing highlighted the following:
- Peak horsepower increased from 320 to 400 hp.
- Torque improved from 400 to 470 lb-ft.
- Throttle response was noticeably sharper, enhancing driving experience.
These results demonstrate the effectiveness of the Comp Cams XE268 camshaft in maximizing the performance of the Pontiac 400 engine.
Conclusion
The installation of the Comp Cams XE268 camshaft in a 1970 Pontiac 400 yields remarkable performance gains, evidenced by an increase of 80 horsepower. This upgrade not only enhances the engine’s capabilities but also revitalizes the driving experience of this classic muscle car. For enthusiasts looking to boost their Pontiac’s performance, the XE268 camshaft is a worthy investment.