Yep. The block fitting is the high pressure side pushing the coolant through the heater core, and the fitting at the water pump is a low pressure area that allows the coolant to complete the return path. By capping the heater nipples off, all you are doing is making the passenger side of the engine cooling the same as the driver's side.
If you are never going to use the heater, then the most permanent fix is to remove the block nipple (not always easy) and put an expansion plug in the head, and then fill the heater nipple on the water pump with JB weld. Kind of freaks people out when they look down at the bare fitting not being capped off. I tried to use a threaded plug, but each time the old timing cover nipple has cracked and I end up just filling things in anyway.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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