"CAN" Heads: There's no known engine head type called "CAN." It's likely a typo.
Stock 454: A stock 454 Chevrolet engine from the 1970s and 80s typically produced around 230-270 horsepower at the crank.
Factors Affecting Horsepower: Here are some key factors that impact the horsepower of a 454:
* Heads: The cylinder heads are crucial for airflow and combustion efficiency. Different head designs can significantly impact horsepower.
* Intake Manifold: The intake manifold determines how air enters the cylinders.
* Cam Timing: The camshaft timing and profile greatly affect horsepower.
* Compression Ratio: Higher compression ratios generally yield more horsepower.
* Exhaust System: A free-flowing exhaust system can help increase power.
* Fuel System: A fuel system that can provide the necessary fuel volume and pressure is essential.
Getting 305 HP from a Stock 454:
* Highly Unlikely: A completely stock 454 with original heads and other components is very unlikely to produce 305 horsepower without significant modifications.
* Modifications Needed: To reach 305 horsepower, you'd need to make changes like:
* Higher-Flowing Cylinder Heads: Aftermarket heads with better ports and valves.
* Performance Intake Manifold: An intake manifold designed for better airflow.
* Performance Camshaft: A camshaft with more aggressive timing and lift.
* Exhaust System: A high-flow exhaust system.
* Possible Compression Increase: Consider increasing the compression ratio.
The Bottom Line: You can certainly modify a stock 454 to reach 305 horsepower. However, it requires careful planning, component selection, and likely some professional tuning.