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Originally Posted by Aurora40
Any pictures of that? What did you do to block it off?
Was the I/H to head gasket a GM one?
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Bob,
Sorry didn't take pics, but its the IH coolant passage that mates with the plenum passage to the TB. Found on either side between primary #4 and secondary #2, primary #3 and secondary #1 runners. I used a 1/8 NPT countersink socket head plug. Drilled out existing hole with 21/64" bit, then tapped with 1/8 NPT tap. Got all at ACE hardware. I put a bleeder valve on the passenger side coolant tube using the same bit and tap.
The I/H gasket I used were from Flatout Racing. Only this time I used a .060" rather than a .030".