No one has picked up on it yet, but some pulley systems will cause overheating. Did you have any overheating issues before the install of the pullies? Might be something worth looking into.
And as far as the 160 thermostat, I've always ran them and never had any issues.
It might also be time to do a compression check and see if the headgasket might have let go.
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91 single turbo vert
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