1. Internal Engine Components:
* Stroker Kit: Increasing the displacement is crucial. A 383 stroker kit (using a longer stroke crankshaft) is a common route to increase power potential. This increases the cubic inch displacement, providing a larger foundation for power.
* Forged Internals: Stock internals won't survive the stresses of high horsepower. You'll need forged pistons, connecting rods, and a forged crankshaft capable of handling the increased power and RPM.
* High-performance camshaft: A camshaft with aggressive profiles tailored for high RPM performance is necessary. The cam's duration, lift, and lobe separation angle will dramatically influence power output. This selection will depend on other modifications (heads, intake, etc.).
* High-performance Cylinder Heads: Stock heads severely restrict airflow. Aftermarket aluminum heads (like AFR, Edelbrock, or Dart) with larger valves, improved porting, and higher flow rates are essential. Proper port matching and potentially custom porting will further maximize efficiency.
* High-Compression Pistons: Higher compression ratios increase power, but this also requires higher-octane fuel (race fuel likely) and careful tuning to prevent detonation.
2. Induction and Exhaust:
* High-Flow Intake Manifold: A high-performance intake manifold (like an Edelbrock Victor Jr. or similar) designed for the chosen heads and camshaft is critical for efficient air intake.
* High-Performance Carburetor or EFI System: A large carburetor (likely a double pumper or a professionally-tuned multi-stage system) or a modern EFI system (with appropriate injectors and tuning) is needed to deliver the required amount of fuel. EFI offers superior tuning capabilities for optimal power.
* Headers and Exhaust System: Long-tube headers designed for the engine's application and a free-flowing exhaust system are paramount for minimizing exhaust restrictions.
3. Supporting Components:
* High-capacity Oil Pump: A higher volume oil pump is essential to keep the engine lubricated under high-RPM conditions.
* High-capacity Oil Cooler: The increased heat generated requires effective cooling.
* High-performance Ignition System: A high-energy ignition system (like a MSD) ensures reliable ignition at high RPMs.
* Proper Tuning: Professional dyno tuning is absolutely critical to ensure proper air/fuel mixture, ignition timing, and overall engine performance optimization. This is where the power really gets dialed in and where you avoid catastrophic failures.
Important Considerations:
* Cost: Building a 500-hp 350 is expensive. The cost of parts, machine work, and professional tuning can easily exceed $10,000.
* Reliability: Pushing a 350 to this level of power inherently reduces reliability unless meticulous attention is paid to quality components and proper assembly. Regular maintenance and careful monitoring are essential.
* Expertise: Unless you have extensive engine building experience, you'll need the help of a professional engine builder. Improper assembly can lead to engine damage or failure.
In short, getting 500 horsepower from a 350 Chevy small-block is a substantial undertaking. It's not a simple bolt-on modification; it requires a comprehensive rebuild with high-quality, high-performance components and professional tuning.
