So form working on some engines out of old Move/Kenari. I noticed that on some twin cam EJ covers there is enough room to pry the spark plug seals out. While on some you can’t. I was thinking is it ok to use a large circular drill bit and using a hand drill to slowly cut a perfect shape around the seals. To pry the seals out? Then seal the edges back with slicone. Does that mess with oil pressure or anything?
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