Good morning. I just recently bought a 2000 pony that has no compression on cylinders 5 & 6. The car doesn't leak or burn coolant nor does it overheat. Previous owner replaced the entire fuel rail, 6 injectors, plugs and wires, and coil all before pulling the cylinder compression... The passenger side of the motor is 100%, 180+ PSI on 1 - 3. The car runs but of course with a misfire CEL. I'm almost positive it has valve issues on the driver side head. My plan is to replace or have the current head overhauled. Has anyone heard of this happening? I have done plenty of work on cars but typically nothing deeper than replacing the intake or working with fuel injectors\fuel rails, etc. What would the difficulty level and or % of success if I was to attempt a head replacement myself? I'm very competent with motors and diagnostics but I've just never tried to pull a head before. Thanks very much for any input you might have?