[quote=&quot;Anonymous&quot;:1unm8ctx]&quot;quote
Could just be sticky valves. I've been having more trouble with that problem as the quality of gas seems to head down.

You could take the valve cover off and check the valve lash, and tap the valves with a hammer to make sure they are moving properly. They don't have to stay open much to make you lose compression.&quot;
Chris Losey

I think sticky valves might be the problem I am having with this 1555 Gas I just bought. What do you suggest to free them up? I adjusted the valves the other day and it seemed the oil getting to the valve train could have been a little more. I have about 28 psi oil pressure at an idle and 32 psi half throttle.
Steve[/quote:1unm8ctx]

It looks like your oil pressure is fine, those Oliver engines never were a high oil pressure setup. It doesn't take but a little bit of oil to keep the valve train lubricated. There are even provisions in that engine to keep too much oil going to the top side.

The first thing I would try is getting a can of Seafoam. You can learn more about it here:
<!-- m --><a class="postlink" href="http://www.seafoamsales.com/motorTuneUpTechGas.htm">http://www.seafoamsales.com/motorTuneUpTechGas.htm</a><!-- m -->

Of all the fuel treatments I have tried, this one works by and far the best. I would recommend putting some in the gas tank and trying that first. That website has other tips for using the product, you can even add it your engine oil to clean up deposits. I have done this to one of my tractors, put it in the oil, ran it for a few minutes, and then changed the oil. That was a couple of years ago, and the engine runs great to this day.