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The air-horn assembly features a quartet of tubes. The outer pair are secondary pickups, while the inner duo work as high-speed air bleeds. Murphy enlarged the bleeds from 0.026 to 0.028 inch. When teamed with richer metering rods, air/fuel emulsification is increased.
1984 Chevy Camaro - Power Struggle

The air-horn assembly features a quartet of tubes. The outer pair are secondary pickups, while the inner duo work as high-speed air bleeds. Murphy enlarged the bleeds from 0.026 to 0.028 inch. When teamed with richer metering rods, air/fuel emulsification is increased.  View Related Article

 

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