A leaking head gasket is part of your compression issue but the fact that the exhaust valve isn't opening is another part of the problem. If the engine can't get air into the cylinder, then there's no air to compress.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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