Topic: Mystery copper lines
When my 1972 Taylor-built Contessa was re-engined about 20 years ago with a Yanmar 1GM10, the previous owner cut -- but didn't remove -- a pair of copper lines that apparently connected the old engine to the exhaust thru-hull. Can anyone tell me what purpose these lines served? They are about 1/4 inch in diameter and run along the port-side of the engine compartment back to the exhaust manifold on the transom thru-hull. Thanks.