Problem with Engine Knock

Posted by Lincoln41 On 2008/2/28 14:24:55

My 1936 Packard 120B was sitting in a garage for approx 20 years. After putting new oil, spark plugs, etc., the car started up fine and sounded like a quiet sewing machine. When I drove around few blocks, I started hearing a knocking noise. Its not a constant loud banging noise, but it comes and goes away. When the engine warms up, the sound usually goes away. I cant figure out what it is??
I can hear more from underneath the vehicle, inside oil pan.