REF: Engine Mechanicals - Sub-02B

Testing the Clearances in Piston Valve Pockets (reliefs)

Clay pressed into the valve pockets can used to test how far the valves come down toward the piston (when installed).

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photo by kwbikr of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/156414-1976-ironhead-hot-street-motor-build-advise-needed-please/page25?t=1674723&page=25
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