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Noticed this AFTER first pass with 350 grit , it later went away with 450/700 & I finished with 1000 grit , I did the same process for all the other valves by hand no drill . Hit them all with 350/450/700/1000 grit diamond lapping paste . This was the only valve seat that had this problem
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bigkermw211e55 October 22, 2023
Noticed this AFTER first pass with 350 grit , it later went away with 450/700 & I finished with 1000 grit , I did the same process for all the other valves by hand no drill . Hit them all with 350/450/700/1000 grit diamond lapping paste . This was the only valve seat that had this problem

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