Undercover Boss
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Comparing cutaway Coyote valves at top to their RoadRunner counterparts at bottom easily shows the Boss part’s hollow stems. It’s also just possible to see the Boss exhaust valve’s slightly flatter head design at bottom compared to the Coyote’s more tulip-shaped valve at top. After lightening the Boss exhaust valve, it was necessary to use a sodium filling to better transfer heat from the head to the area of the stem surrounded by the valve guide; obviously the sodium filling is not shown here. View Related Article
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