Semi-finished Oversize Exhaust Valve Guide for High Performance EVO Twin Cam

.025in. Oversize Intake - OD .5875in ID .3090in Special high-temp Viton O-ring seal prevents oil form passing between the guide and the head. Smooth lead-in section for best alignment during installation. CNC machined to exact specifications for each application. Smooth finish prevents damage to ID of receiver holes. Chamfered IDs prevent oil from being scraped away at every stroke of the valve. Guide ID is unfinished and ready to be precision reamed or honed. Mid-Year 3 Semi-finished Oversize Exhaust Valve Guide for High Performance EVO Twin Cam