 J Precision high flow valve seat profiles are designed in house and are machined on a NEWEN CONTOUR CNC valve seat machine to give you the most accurate and efficient seat job in the industry resulting in more power and durability. |  Our high velocity ports and seat profiles are developed using a state of the art Flow Data computerized flow bench. |
 Advanced valves & valvetrain (AV&V) are on the cutting edge of the newest developments for the Harley-Davidson valvetrain and this is why J Precision relies on them. |  Heads are cleaned in a sophisticated ultrasonic cleaning machine before final assembly. |