yeah what is the torque settings on the valve cover, so many videos on these valve covers on ebay and hardly anyone bothers torque and sequence, oh well you can all learn from your own mistakes when you break the bolts or have to redo the job because you didnt get a correct seal, never mind i found out correct torque is 10 NM or 7.4 foot pounds with no tightening sequence go from centre to the outer bolts, I am an auto technician since 2000 amatuers everywhere LOL
Ive had my Barina Spark in at the mechanics due to the same thing - couldn't change the plugs because these bolts were free-turning in place - it's been giving the mechanic some grief getting it sorted - That's why I'm on here, as I wanted to get an idea of what the hell is the fix for it / replacement ? or re-bore the bolt holes maybe?
@markrengel7880 two tips, apply heat. Mine had overheated and the heat from the engine meant they weren't "screws" anymore. Alternatively, tap in a diamond head and go from there. Good luck mate