I apologize but I made a mistake in my tests. When I could hear a hiss from the muffler and exhaust it was because as I filled up the chamber with air the piston pushed down slightly and was no longer at top dead center. After redoing the test and makin sure I kept the camshaft from turning I no longer had air escaping through the muffler. However, I do feel and hear a hissing sound coming from the exhaust valves/ springs/ (4 valve head). But only from there on the top side. Nothing from intake side. I hope this better explains my situation. Thanks.
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