Coolant leaking

Uhh... where is the coolant going if it's not leaking out?

You've got some odd problems if you have 7 black and 1 white spark plug. Are the black ones oily black or crispy black? White spark plugs are normally a good sign for extreme temperatures/pressures caused by excess timing, poor fuel, high compression, or a combination of all three. Of course, the fact that your compression is all the same sort of blows a hole in my leaking cylinder theory.

Hmm...

You wouldn't happen to have ensured that you are getting spark at each spark plug have you? Obviously this doesn't solve your coolant problem but it's a start at something.

The only other thing I can think of is that you have a transfer of coolant into one of your cylinders (possibly #6) and it is getting pumped out your tailpipe. This would explain the loss of coolant and the crusty spark plug. Might be worth taking off that head.

Take it to get a coolant leak test.

94mustangcobra said:

already been done and it loses pressure fairly quickly

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Are your head gaskets ok? What about your intake gaskets? Check 'em out.