Intake Valve GuideCaracteristicas: Precision machined guides Manganese bronze guide material is softer than nickel aluminum bronze valve guides Excellent heat conductivity which promotes long valve life Guides can be easily reamed with a battery operated or electric drill and finished with a high quality ball hone Eliminates the need for expensive honing equipment that would be required for nickel bronze valve guides Machined to accept OEM and aftermarket seals Made in