I. Relatively Simple and Affordable Modifications:
* Air Intake System: Replacing the restrictive factory air filter and intake tubing with a cold air intake system (CAI) can provide noticeable gains in airflow and power, especially at higher RPMs. Ensure the CAI is properly sealed to prevent unmetered air from entering.
* Exhaust System: A performance exhaust system (headers, high-flow catalytic converter, and free-flowing muffler) reduces back pressure, allowing for easier exhaust flow and potentially increasing horsepower and torque. Check your local emission regulations before making changes to the catalytic converter.
* Ignition System: Upgrading to a performance ignition system (e.g., new spark plug wires, distributor cap and rotor, and possibly an upgraded coil) can improve spark delivery, leading to better combustion and slightly increased power.
* Tune-Up: A thorough tune-up, including fresh spark plugs, plug wires, air filter, and fuel filter, is crucial for optimal performance. Consider using performance spark plugs designed for your application.
II. More Involved and Potentially Expensive Modifications:
* Performance TBI System: Upgrading to a larger throttle body or a modified TBI unit can improve airflow. However, this often requires tuning adjustments to maintain proper air/fuel mixture.
* Computer Tuning (Chip or Reflash): A custom-tuned computer chip or a professional reflash of the PCM (Powertrain Control Module) can significantly optimize fuel delivery and ignition timing for your specific modifications. This is crucial if you've made significant changes to the intake or exhaust.
* Cam Swap: A performance camshaft with higher lift and duration can significantly increase power, but this requires extensive engine work and potentially other related modifications (e.g., valve springs, pushrods). This is a more advanced modification and should be done by someone experienced with engine rebuilding.
* Head Work: Porting and polishing the cylinder heads can improve airflow, but this is labor-intensive and requires specialized tools and expertise.
* Intake Manifold Upgrade: While less common on TBI systems, an upgraded intake manifold could provide slight gains. This modification might require careful consideration of compatibility.
III. Significant Power Increases (Advanced and Expensive):
* Forced Induction (Turbocharger or Supercharger): This is the most significant power adder, but also the most expensive and complex. It requires significant modifications to the engine and fuel system, and proper tuning is critical to prevent engine damage.
* Engine Swap: Replacing the 350 TBI engine with a more powerful engine (e.g., a later-model Vortec 350, a crate engine, or even a different engine altogether) is a drastic but highly effective approach. This is the most expensive option and often involves significant fabrication work.
Important Considerations:
* Budget: Determine how much you are willing to spend. Modifications can range from a few hundred dollars to several thousand.
* Mechanical Skill: Assess your mechanical abilities. Some modifications are straightforward DIY projects, while others require professional expertise.
* Emission Regulations: Be aware of your local emission regulations. Some modifications may not be street legal in your area.
Start with the simpler and less expensive modifications first. See how much power you gain and then consider moving to more significant changes. Always ensure that any modifications are done correctly to avoid potential engine damage. Consult with experienced mechanics or enthusiasts for advice before undertaking major engine modifications.
