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The Engine - more specifically - the heads.
WHILE THE MOTOR IS WARM . OR TRADE IT OFF AN SAVE THE TROUBLE
There is a dangerous way, drilling it out but you will have to remove the head from the motor so you dont get metal chips inside the motor. Just make sure you dont drill the threads out. I highly suggest you take it to a mechanic and let them work with it
I do not understand why you want to remove the porcelain if it is broken off. Just remove & replace the spark plug which is no longer any good if the porcelain is broken.
Blown Head Gasket or Warped Head from Overheating
find the plugs that connect to the plugs and pull them off.after that you can remove the plugs.
There on the top top of the motor. lots of disassemble if you ain't goood mech. do not attempt.
You need to remove the valve cover ((V8) motor) and remove the spark plug coils, then you can change the plugs.
Inside the valve covers.
You use an eas-out.
.054
If you remove your seat, then remove your gas tank and radiator shrouds, then theres a black rubber coil going into the front/top of the motor remove that. then bam spark plug