Sunday I finally got my 1990 4Runner with a V6 engine back together after replacing the left side head gasket. Before I took it apart 4 of the 6 cylinders had good compression. I replaced the left side head gasket, radiator, water pump, all belts, and some various vacuum lines and hoses I saw to be questionable. The left cylinder head was taken to the machine shop to be cleaned and milled. The shop also did a valve grind and adjusted the valves. I did not remove the right side. Now, none of the cylinders is building compression.
Could someone tell me where to start diagnosing this? Why would the right side not be building compression if it was fine before? What did I do wrong?
Any help is appreciated.