another 360/408 over heating

rod7515 said

I also run the car until I can see coolant flow before I put the cap on which would move any air pockets.
Im not sure what the reason khuebner250 suggests to replace the cap? What lb pressure cap are you suggesting to go to? As for the pump its an 8 vein and it also has the machined plate with a closed back just as the flowkooler pumps do.
Thanks, Rod

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Radiator caps can go bad and do go bad all the time. I'd suggest a stock replacement? Bad cap symptoms:
Overheating, obviously. Cap won't hold/build pressure. Therefore, the boiling point won't be decreased by pressure.

Hose collapsing after cooling means the cap won't equalize pressure.

Just my thoughts, you may be able to have your cap pressure tested at a local shop for free or maybe a parts store had a stant tester you can use.