AMC Replacement OE Spec M5X/S5X Cylinder HeadThese are our go to choice for a factory replacement option for the M5X S5X platform. If you plan on having a CNC race port or other significant work done to your head in our opinion it's not worth risking using a high mileage potentially cracked OEM head. We import these and try to keep stock on hand in the USA to cut down on otherwise significant lead times. This is just for the bare head casting. No valvetrain included. We would be happy to assist