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Hello there again. You and I have similar problems as far as the white smoke coming out of the exhaust. I should have expanded a little more about the head gasket. I just pulled the head on my TO-35 and it was a warped head that caused my head gasket to fail. I had white smoke streaming out of the tail pipe, but I did not get the coughing that you described, which tells me that my valves were in good shape. I checked the mounting surface with a metal ruler. I sent the head out to be shaved to take care of the warp problem. I'm also having the rest of the parts on the head replaced since I've gone this far. I had mentioned before to check your oil for color and clarity in case there was coolant getting into it. It's good that your oil seems to be holding up, but it doesn't rule out the head gasket or warped head problem. You may be getting coolant in the cylinder(s) without it getting into the oil. Pay attention to the smoke coming out of your tail pipe. If it is white, it is steam. If it has a blue tint, it is oil, but it may be because of the MM Oil. Another quick and painless check is to pull your spark plugs and with a flashlight, look at your pistons. If you have coolant getting into the cylinder(s), those pistons will look, brand new, out of the box clean. The cylinders that aren't getting coolant in them will have carbon on them. Also, watch to see if you seem to be using more coolant than normal. The puff of smoke where the exhaust pipe meets the manifold suggests a loose connection there. That's a minor problem. Billy pretty much covered the sticky valve situation in his post. Hope this helps! ~ Dave
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