Coolant lines on intake maifold?

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Jun 21, 2010
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Portland, OR
This was in an ad on CL for some HP engine parts. Got me curious.
What is the purpose of these lines?
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It balances the flow of coolant from the back of the engine to the front and helps eliminate air pockets too. It actually works rather well.
 
Normally the rear port is just capped off, this is why it's important to get the gaskets on the right direction. :)
Curious how those hoses do for the center cylinders and if it rushes the water before it absorbs the heat?
 

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