Head question

[Michigan Skip]

What is the purpose of the water pipe on the back of the heads? I hope that's not the only way water is circulated through the heads!
TIA
Skip

[wolfdogs]

to pipe water.....................




bet Fred knows the details

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Wolfman (KenC)
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Founder: MAFBA (retired)
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1997 CompTA #139 (fFOR SALE)
1997 Firehawk #132 (FOR SALE)
2003 Envoy SLT (hers)
2004 Envoy SLT (mine)

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[Injuneer]

Only way for air and steam bubbles to get out of the head. It is extremely important on high performance LT1's with the reverse flow cooling. A buddy of mine has gone to the effort of piping from each head individually, forward to the seperator in the radiator, using -8AN braided hoses.

From the "Rebuilding the LT1" article:

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.

There is a good flow of coolant through the line, and I use that line as the location for an extra coolant temp sensor, near where it returns to the radiator:

[Michigan Skip]

Thanks Fred!