1. Cylinder Head Design: 327 heads may have different combustion chamber shapes, valve sizes, and port configurations compared to the original 350 heads. If the 327 heads are designed for better airflow and efficient combustion, they can improve the engine's volumetric efficiency and power output.
2. Compression Ratio: The combustion chamber volume of the 327 heads will affect the engine's compression ratio. If the 327 heads have a smaller combustion chamber volume, it can increase the compression ratio, resulting in more power and torque. However, a higher compression ratio may require higher octane fuel to prevent engine knocking.
3. Camshaft Compatibility: The camshaft profile should match the characteristics of the 327 heads and the 350 engine. If the camshaft is not properly matched, it may not take full advantage of the improved airflow and combustion efficiency provided by the 327 heads.
4. Other Engine Modifications: The effectiveness of installing 327 heads also depends on other modifications made to the engine. For example, if the intake manifold, exhaust system, and fuel delivery system are not optimized to support the increased airflow, the full potential of the 327 heads may not be realized.
5. Engine Tuning: After installing the 327 heads, it's important to have the engine professionally tuned to optimize ignition timing, fuel mixture, and other parameters. Proper tuning can maximize the power gains from the head swap and ensure the engine runs smoothly and efficiently.
In general, installing 327 heads on a 350 motor can provide some horsepower improvements, especially when combined with other complementary engine modifications and proper tuning. However, the specific gains will depend on the specific head design, engine configuration, and overall setup. Consulting with an experienced engine builder or mechanic can help determine the best course of action for your specific engine and performance goals.
