* No engine specifics: I need more information about your 302 engine. Is it a Ford 302? What year is it? What is the compression ratio? Is it a naturally aspirated engine or does it have a supercharger/turbocharger?
* Component variations: Even within the same categories (e.g., E303 cam), different manufacturers and even individual units can have slight variations that affect performance.
* Installation and tuning: How well the components are installed and tuned will play a huge role in the final horsepower gain.
However, here's a general idea of what to expect:
* E303 Cam: Expect a noticeable gain in power and torque, especially in the mid-range. It's a popular cam for street applications, but it can be a bit aggressive if you're looking for a purely stock-like feel.
* Cobra Upper & Lower Intake: These intakes will help improve airflow and generally result in a horsepower and torque increase, especially at higher RPMs.
* 70mm Throttle Body: This will improve airflow, potentially leading to a slight horsepower gain, but it's most effective when combined with other modifications that improve airflow throughout the engine.
* Roller Rockers: These can improve valve train efficiency and reduce friction, resulting in a slight increase in horsepower.
* Aftermarket Exhaust Headers: This is a good starting point for increased power, and it will work in conjunction with the other modifications.
To get a better estimate:
1. Consult a professional: Talk to a knowledgeable mechanic or engine builder. They can assess your specific engine and provide a more accurate horsepower estimate based on their experience and your goals.
2. Use online calculators: There are online horsepower calculators that can give you a rough idea of power gains. However, these are often based on generalizations and don't factor in the specifics of your engine.
Remember, horsepower is just one aspect of performance. Consider what other aspects of your engine's performance are important to you (e.g., torque, fuel economy, drivability) and make sure your modifications are tailored to your needs.
