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I was having problems with the engine running after it reached operating temparture. It would idle roughly. When I took off valve covers the rocker arms and push rods were covered with carbon. The push rods were covered with a good coating of carbon. When I replaced the push rods and rocker arms I got very little oil coming out of the push rods. The lifters are the roller type. I rebuilt them one at a time. I took them apart and clean them and made sure they were free of dirt. I put them back were they were came from. I had the engine in time and adjusted the rocker arms according to the firing order. 1 6 5 4 3 2. I made sure both valves were closed and adjusted the rocker arms by holding the push rods and checking for play. After the up and down play was gone I gave the adjusting nut another full turn. It doesn't seem there is enough oil coming from the push rods. It seems to be smoking a little as the valve springs are over heating. The oil pressure at the sending unit is 50 PSI. That is from the main oil tap on the drivers side near the distrubitor.