Essential Components for ~350hp:
* Engine Block: A good starting point is a 350 cubic inch (or larger) block. Later model blocks (like those from the late 70s and 80s) are generally stronger. Consider a rebuild or a professionally prepped block for added peace of mind.
* Cylinder Heads: This is a major factor in power output. You'll want performance heads, not stock replacements. Options range from aftermarket aluminum heads (e.g., Edelbrock Performer RPM, AFR, Dart) offering significant flow improvements, to mildly ported stock heads (a more budget-friendly option, but yielding less power). Aluminum heads are lighter and dissipate heat better.
* Camshaft: A performance camshaft is critical for 350hp. The correct cam profile will depend on your intended use (street, strip, etc.) and other components. A camshaft with increased lift and duration will improve power, but may also impact low-end torque and idle quality. Consult a camshaft selection guide or experienced engine builder for the best choice.
* Intake Manifold: A performance intake manifold, matched to your heads and camshaft, is essential for efficient airflow. Options include single-plane (better for high RPM power) and dual-plane (generally better for street driving, offering a balance of low and high-end power). Material choice (aluminum vs. cast iron) also matters.
* Pistons and Rods: Stock pistons and rods might be sufficient for a mild build, but for more aggressive power targets, forged pistons and stronger rods are recommended for reliability at higher RPMs and under increased cylinder pressure.
* Crankshaft: A properly balanced and strong crankshaft is crucial, especially at higher horsepower levels. Stock crankshafts in good condition may suffice for a milder build, but for significant power increases, a forged crankshaft is a safer choice.
* Carburetor or Fuel Injection: A performance carburetor (e.g., Holley, Edelbrock) or fuel injection system is needed to deliver the required fuel and air mixture. Fuel injection offers more precise control and is generally easier to tune.
* Ignition System: A high-performance ignition system, potentially including an electronic ignition and higher-output coil, will provide a more consistent and powerful spark.
* Exhaust System: Headers (long-tube or shorty) and a free-flowing exhaust system are critical to maximize power. Restricting the exhaust limits power potential.
Other Important Considerations:
* Valvetrain: High-performance valve springs, pushrods, and rocker arms are needed to handle the increased lift and RPM of a performance cam.
* Oil Pump: An upgraded high-volume oil pump is important to ensure adequate lubrication under increased pressure and higher RPM.
* Cooling System: A more efficient cooling system, potentially including an upgraded radiator and fan, is needed to manage the higher heat generated by a more powerful engine.
* Professional Tuning: Proper tuning of the carburetor or fuel injection system is crucial to achieve optimal performance and prevent engine damage. This often requires a dyno tune for best results.
Building a 350hp small block is a significant undertaking. It's advisable to consult with experienced engine builders or mechanics to ensure proper selection and installation of components. Improperly assembled or tuned engines can lead to significant damage or failure. Budget accordingly, as the cost can range widely depending on the parts chosen and the level of professional assistance required.
