what is the deal with my 225 /six compression?
Should I redo it with the plugs all out?
If you want to, you can. It looks ok from what you did, re-doing it will give you better numbers and better accuracy.
It's good to get a snap shot of what your engine is over time. If you re-do the test, do it two ways, wet and dry.
By dry, you test each cylinder as is after removing the spark plugs.
The wet test you get an oil squirt can and put 3 squirts of oil in the cylinder and re-test it and see if your numbers are any higher. Do this for each cylinder.
If you get a much higher number wet than dry (20 or more), then your loss is in the piston rings.
If you get a low number wet and dry, then you may have a problem with the valve seats. The next step would be to do a cylinder leak down test if you are interested in finding out which valve in which cylinder is leaking. Or remove the heads and get a valve job.
If you get a similar number wet and dry (about 5 psi) that is over 110-120 psi, then you should be ok.
