We use the Hayden 2747 on EVERY Pontiac we have to swap out.
It's the Heavy Duty version for most Pontiac V8s with clockwise rotation.
Rockauto sells them for $35.79 plus shipping and tax.
As noted, the HD and SD go full 'ON' at 195-205*, but we've also found that they slip significantly less when disengaged. So they're always pulling extra air - that's a good thing.
And the mod to make them kick in earlier is not that difficult. Youtube has several decent videos showing how to re-bend the thermostatic spring. Just be careful and take your time so you don't break it.
Good luck!
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