1st time out with top end, new seals, 30 hrs on crank.
At the end of break in, when I started picking up RPM’s, I first noticed this problem, never experienced anything like this before, never ran this cylinder before. I have had this cylinder for 5 yrs and finally had the juevos to put this massively ported cylinder on a motor. I don’t know if there is a problem with the cylinder and that is why it came as an extra in a “motor package”.
One thing I forgot to mention, the cylinder has an “o” ringed head, I am experiencing a minor coolant leak on the exterior between the cylinder and head, with no coolant loss and no coolant in combustion chamber.