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Just found this excellent thread. Water Pumps. I have a 1950 (P20) 218 engine that came from a local hotrod shop- a young guy in Kerman CA who collect and restores 1950 Plymouth Suburbans. He sold me this motor with a Wilcap adapter that will allow it to bolt up to a GM automatic tranny (I'm using a TH 200 4R) He said it was running and driving great when he had it, but the 218 didn't have enough off-the-line power for him. It has the '53 and later internal bypass thermostat, and straight neck and it looks just like JB Neal's pictures , including a newer NAPA water pump. Am I understanding correctly that even though the new NAPA water pump will work with both pre and post '52 block designs, using the internal type on the older external blocks will lead to warmup and/or operational problems?
