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If the bare heads are shipped with a finished valveseat, as is the case with these Pro Topline castings, the next step is to trial-fit the valves to the seats to see how they mate. Mike Johnson of JMS showed us a good trick to illustrate the contact between the valve and seat. First, he uses a marking pen intended for a dry-erase board to coat the seating surface of the valve with ink. View Related Article
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