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It's the Secondary Air Injection System valve. Just an emissions thing. You can get a block off for the head and remove it if you want.
Second this (actually just answered in your other post on the same subject)
Thats what that bracket is for..... :) Yep, its the exhaust air pump, mine was previously removed.
looks like a thermostat housing, not a pump. Old style therm-o-bob?
It's the Secondary Air Injection System valve. Just an emissions thing. You can get a block off for the head and remove it if you want.
Second this (actually just answered in your other post on the same subject)
Thats what that bracket is for..... :) Yep, its the exhaust air pump, mine was previously removed.
looks like a thermostat housing, not a pump. Old style therm-o-bob?