When you re-torque the head screws tighten them in stages and criss-cross the head while tightening. If it has 6 screws - tighten 1 & 4, then 2 & 5, then 3 & 6. Start with enough torque to seat the head on the cylinder - do all 6. Then start over and tighten to snug. Then start over and tighten to tight. If you use brute force - you will need to get the head repaired.

HTH

RCUtechs must be on a dinner break and have taken the picture server with them for company ...