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On the IA32 the timer interrupt is also disabled after the CLI instruction correct?

Just making sure... I second guess myself into a corner...

Suppose if I wasnt quite as lazy I would code something to test it, o maybe read a manual...

Every external interrupt (not sure about the NMI) is blocked when you execute CLI.

CLI only stops IRQs. NMIs(e.g. div by zero/triplefault) and software ints still working.
And yes, the PIT timer IRQ is stoped.
But i dont know what the CMOS Realtimer is doing after CLI.