[clickman]

You may be hooped. Do a Search, but my recollection is that there are small passages in the heads that you likely won't be able to clear out, creating hot spots and potential cracking.

I'm changing out my pump in the next few weeks as preventative maintenance (along with installing the 160 degree thermostat and "S" oil cooler). Although I "only" have 92,000 km on the car, the water pump is still 10 years old.