The Edelbrock #5027 E-Series Cylinder heads are designed for Small-Block Ford applications. The Edelbrock E-Series cylinder heads are a step up in affordable performance from our E-Street line. They feature larger runners for increased airflow, revised exhaust ports and larger diameter springs for higher lift camshafts, making them ideal for a spec series racer and larger displacement engines. The Edelbrock #5027 E-Street Cylinder heads also have as-cast ports and maintain the stock exhaust port location, making them compatible with OEM headers and hardware.