Bad/Weak water pump?????

TrailBeast said

I was going to suggest that, but you sure have a lot of stuff in the way to do twice if you just take it out.
If you do take it out drive it on the hiway before making the decision, because it could still be the radiator or crap in the block causing it.

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There is almost nothing in the way of the thermostat housing. The very first pic I posted has a pretty good view, it looks very easy to get to. Would crap in the block make the water pump have low flow?? The motor had a complete overhaul by the previous owner (came with receipts) I guess I could buy a new 160 degree thermostat (I live in a very, very hot and humid climate) and swap it out that way if I still get low flow I can still assume it's the pump and I won't have remove the thermostat housing again (just the pump).

treblig