Re: compression readings
Dness... A 1989 200hp V6 should have approximately 95 psi on the starboard bank and 90 psi on the port bank. No, I do not know why there's a 5 psi difference between the banks but that's the nature of the animal.
Obviously the engine's been rebuilt but it's highly unusual to have "all" the cylinders rebored. Whether it's toast or not depends on its present performance, whether the cylinders were bored properly, and the condition of the cylinder walls and pistons.
You've got 9 psi difference between the lowest and highest reading.... not too bad, pretty close I'd say.
Jethro66.... You have 15 psi difference in the compression reading. Yes, it would be a good idea to try Sea Foam.
Dness and Jethro66..... Rather than add to someone elses topic, it would be better to start your own. As it stands, both of your questions are pretty well buried which will be missed by many other members. I just happed to stumble across them.
