Running without a thermostat ok?

I didn't want to read 4 pages of conflict so In my experience I have replaced many engines because of overheating. because someone removed the thermostat and at about 2000rpms the lower radiator hose sucks shut cutting of all water flow, most replacement hoses forget the wire insert .. just by 2 cents, hope it helps.

Very good point! I have crammed old valve springs in a lower hose before to stop that and it didn't occur to me in this post.