I didn't pull the valve covers. There is nothing on the oil cap or in the anti-freeze. It's just missing at idle and blowing thick white smoke. It smooths out when I rev it up, but after 20 mins, it is still blowing thick white smoke. I'm thinking the HG is blown between cylinder and water jacket. Parts alone are $400, not to mention the labor.And that don't include replacing a head if needed. I can get a motor for $600, and it would cost me another $50 for oil, filter, and anti-freeze, plus $300 to install it. Haven't got a price on labor for doing HG's yet. Thought I got a deal, guess not.