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You can do it either way. To block them, you can tap the holes with a 3/8 and 1/2 NPT tap. They way I understand it, when you block them a freeze plug with a small hole is needed inside the water pump to correct the flow. here's a good read on ithttp://www.pirate4x4.com/forum/general-4x4-discussion/847999-lsx-thermostat.htmland a picture of mine blocked off
You can do it either way. To block them, you can tap the holes with a 3/8 and 1/2 NPT tap. They way I understand it, when you block them a freeze plug with a small hole is needed inside the water pump to correct the flow.
here's a good read on it
http://www.pirate4x4.com/forum/general-4x4-discussion/847999-lsx-thermostat.html
and a picture of mine blocked off
