Finally took the hood off and retorqued the head bolts. Moving on to investigating the reason why this takes so long to heat up. After taking thermostat out and removing the gasket that seals inside the housing I could make out the temp of 140. Now I know why it never got very warm yet it was working correctly. My question is this. What should be the correct temp thermostat. 1951 B. Running with a 140 I noticed a slight milky layer along some of the inside of valve cover. I have no water in oil and no evidence of anti freeze anywhere but I suspect this engine is not running hot enough and this could be causing condensation. Is my assumption correct? Should I try a 160 or a 180. This is mostly a parade tractor but I want to start working the gal a little bit. Thanks for the input.