One other item, the thermostat housing is non-metallic, so it can deform over time. Good to replace when you're in that area.
Last item, coolant overflow tanks can fail. I put temp reflecting material on the underside of the header shield and the flexible radiant blocking panel above the header shield in an attempt to reduce the heat soak from the header to the reservoir.
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Paul
82 911SC - 3 yrs of fun (traded-in)
06 MINI Cooper S - 19 yrs of fun (sold)
2011 Cayman (she purrs, loudly)
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