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 the U.S.A.. GUIDE VLV 48-77BT+.002MAG
