[speedo]

These are great engines...they will run on 5 cylinders eh? Number 5 shows barely any compression...the others1-2-3 show between 105 and 110 psi. Number 4 shows 103 and 6 shows 95 psi. The big question is...if a cylinder shows almost no compression ( versus low 60-80 psi), does this tell me that it's not a ring problem , and since it doesn't sound like metal inside the cylinder that it's probably not a hole in the piston, but since it does burn oil ...bluish-white...that maybe we're talking a stuck valve or broken spring on the exhaust? While doing the compression check I had all the plugs pulled to check their gaps and as I worked from 1-6 ....there was a "popping" sound out of the 5 plug hole. Do I drop it and tear into it or can it be dealt with from the top side?