1. Engine Block and Internal Components:
* Block: A Dart SHP or similar aftermarket block is highly recommended for this power level. Stock blocks can handle it, but the risk of failure increases significantly. Consider a 4.000" bore spacing block for maximum displacement potential.
* Crankshaft: A forged steel crankshaft is essential. The stock cast crank won't withstand the stresses of 550hp reliably.
* Connecting Rods: Forged H-beam connecting rods, sized appropriately for your chosen stroke and piston diameter.
* Pistons: Forged pistons, likely with a higher compression ratio (around 10:1-11:1 depending on fuel and intended use). The piston choice will significantly impact the overall powerband and performance characteristics. Consult a piston manufacturer to determine the best fit for your chosen components.
* Cylinder Heads: High-flow aluminum cylinder heads (AFR, Edelbrock, Dart) are mandatory. You'll likely need aftermarket valve springs, retainers, and pushrods to complement the heads. Porting and polishing the heads further enhances airflow.
* Valvetrain: A hydraulic roller camshaft with aggressive lift and duration profiles is needed. The camshaft selection is crucial and will heavily influence the engine's powerband and idle quality. Consider consulting a camshaft specialist.
* Oil Pump: A high-volume oil pump is necessary to ensure adequate lubrication under high RPM and stress.
* Oil Pan: A baffled oil pan prevents oil starvation during hard cornering and acceleration.
2. Induction and Exhaust:
* Intake Manifold: A high-performance intake manifold designed for your cylinder heads. Options range from single-plane (more high-RPM power) to dual-plane (better low-end torque). Your choice depends on the intended use of the engine.
* Carburetor or EFI: A high-cfm carburetor (e.g., 850cfm or larger) or a fuel injection system (preferably aftermarket) capable of delivering the required fuel flow. EFI provides better control and tuning capabilities.
* Headers: Long-tube headers are crucial for maximizing exhaust flow and power. The header design and material (stainless steel is preferred) will affect performance.
* Exhaust System: A free-flowing exhaust system, sized appropriately for the engine's displacement and power output, completes the exhaust path.
3. Fuel System:
* Fuel Pump: A high-pressure fuel pump capable of supplying the necessary fuel volume.
* Fuel Lines and Regulators: Upgrade to high-flow fuel lines and a properly adjusted fuel pressure regulator.
4. Ignition System:
* Ignition Coil: High-performance ignition coils for increased spark energy.
* Ignition Control: A programmable ignition controller allows for fine-tuning of timing curves for optimal power and drivability.
5. Cooling System:
* Radiator: A larger capacity radiator with high-efficiency cooling fans.
* Water Pump: A high-flow water pump.
6. Professional Tuning:
* Dyno Tuning: This is absolutely crucial. After assembly, professional dyno tuning is essential to optimize the engine's performance, fuel mixture, and ignition timing. This step ensures both power and reliability.
Choosing a Displacement:
A 350 cubic inch (5.7L) small-block can achieve 550hp with careful planning and execution. However, a slightly larger displacement (383ci or even 400ci) might be easier to achieve this power goal, requiring less aggressive internal components.
Important Note: Building an engine to this power level requires significant mechanical expertise or access to a qualified engine builder. Attempting this without proper knowledge and tools can lead to engine damage or even injury. This is a high-performance build, and safety should always be a primary concern.
