Overheating on run stand

Pictures are worth 1000 words.

I see you are running a cast iron water pump.

(driver's side lower hose exit)

Just wondering if that old school water pump is flowing enough for your updated 340 engine to keep it cool?

View attachment 1716252294


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The early 340 came with the cast iron water pump. The 68 4 speed 340 was the hottest one.