Description:

Maximize the performance of your Milwaukee-Eight (M8) engine with Ward Performance’s CNC porting service for the HD and S&S 55mm intake manifolds. Designed for M8 heads, this service ensures optimal compatibility and enhanced airflow. Both the Harley-Davidson SE 55mm manifold and the S&S 55mm manifold follow similar designs, allowing us to use the same precision 5-axis CNC porting program for both models.1 This seamless approach ensures that, regardless of which manifold you’re running, you’ll experience significant power gains and improved throttle response.

Using advanced 5-axis CNC machining, we shape the manifold’s ports to reduce turbulence and increase airflow efficiency, giving your engine the power it needs to perform at its best. Experience a dramatic increase in airflow and performance. Our service delivers an average gain of 22 CFM on the S&S 55mm and 14 CFM on the HD SE 55mm, giving you more power and a smoother ride. While both throttle bodies see impressive improvements, the ported SE 55mm ultimately provides a superior flow, outperforming the ported S&S 55mm by about 10 CFM overall.

Whether you're building for street use or pushing limits on the track, the Ward HD/S&S 55mm ported manifold provides a performance upgrade that stands out. This service is especially ideal for naturally aspirated builds or M8 engines with mild cam upgrades looking to unlock smoother power delivery across the RPM range.