Product_description: ['Precision-machined guides<br/>Manganese bronze guide material is softer than nickel aluminum bronze valve guides<br/>Excellent heat conductivity which promotes long valve life<br/>Material hardness helps support valve guide longevity<br/>Guides can be easily reamed with a battery-operated or electric drill and finished with a high-quality ball hone<br/>Eliminates the need for expensive honing equipment that would be required for nickel bronze valve guides<br/>Machined to accept OEM and aftermarket seals<br/>Great choice for the home builder<br/>Made in the USA']

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