Another Thermostat / Housing question.

I originally purchased this neck and this T-Stat for my SB. It came as a kit.

Mopar Performance P4286759: Chrome Thermostat Housing Fits All Slant Six, Small-Block, Big-Block & HEMI Engines 1978 & Prior | JEGS
Mr Gasket 4367: Hi-Flow Thermostat Chrysler, Dodge | JEGS

I drove the car twice and on the 2nd run the T-Stat wouldn't open. So I pulled it.

I...

Another Thermostat / Housing question.

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