These performance components are designed to replace the factory-installed parts atop an engine block, directly impacting airflow and combustion efficiency. As aftermarket options, they frequently feature enhanced port designs and larger valve sizes compared to their stock counterparts. The goal is to maximize the intake and exhaust flow, leading to a greater potential for horsepower and torque generation within an internal combustion engine.
The appeal stems from their potential to significantly boost engine output without requiring a complete engine overhaul. By optimizing the flow of air and fuel, these components contribute to improved volumetric efficiency. Historically, they have been a common upgrade path for enthusiasts seeking increased performance in street, strip, and off-road applications. The performance gains realized can vary based on engine displacement, camshaft profile, and other supporting modifications.
