LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Cross Over Tube On Back Of Heads

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Old 11-19-2007, 05:05 PM
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Cross Over Tube On Back Of Heads

Replacing blown head gasket. What is the intended use for the cross over in the back of the heads. I understand it is to flow coolant, but do I need to run the cross over or can I plug them??
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Old 11-19-2007, 05:06 PM
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You need it.
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Old 11-19-2007, 05:07 PM
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you seriously need it!
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Old 11-19-2007, 05:17 PM
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OK...... but what is it for??
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Old 11-19-2007, 05:19 PM
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coolant return flow
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Old 11-19-2007, 05:23 PM
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It is used to vent the steam out of the heads to prevent air pockets and overheating and warping the head.
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Old 11-19-2007, 05:25 PM
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To get rid of steam pockets in the heads.
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Old 11-19-2007, 05:48 PM
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Originally Posted by Zepher
It is used to vent the steam out of the heads to prevent air pockets and overheating and warping the head.
precisely stated
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Old 11-19-2007, 06:18 PM
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Originally Posted by Zepher
It is used to vent the steam out of the heads to prevent air pockets and overheating and warping the head.
i never new that actual intent for the cross-over until i read this month's car craft
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Old 11-19-2007, 07:12 PM
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if you do a TB bypass, the coolant flows directly into their instead of the TB. That should give you a better "picture" of whats happening.
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Old 11-19-2007, 07:15 PM
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Originally Posted by ChevalierSS
i never new that actual intent for the cross-over until i read this month's car craft
They probably read it off this board.
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Old 11-20-2007, 11:04 AM
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Its been in this article for about 8 years:

http://www.automotiverebuilder.com/ar/ar99928.htm



EXTERNAL COOLANT LINES

There is an extra hole that goes into the water jacket on both ends of the heads. These should be plugged when they’re in the front, but left open when they’re on the back. There’ s an external coolant transfer line that connects the holes on the back side to a reservoir that vents the air and steam vapors that would be trapped in the head and cause hot spots.
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Old 11-20-2007, 11:38 AM
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What size are the bolts?
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Old 11-20-2007, 03:45 PM
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the bolts have holes in them so you need to go to a GM dealer and buy the right ones.
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