L98 plenum

Just bought a powder coated plenum. Supposed to have been off a 89. But it is not. I have removed EGR and smog pump from my 89. The plenum and TB are
diffrent. Is the extra triangular shaped hole between the TB and plenum used for EGR? If not what is its purpose? Or is it part of the IAC. What will happen if I simply use my TB on this style plenum? Also the runners are set up for cold start. I hopefully can use a plug like a expansion plug for a block if I can find one to fit. If not wher can I buy a blockoff plug. Thanks
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
The plenum seem like the one on my 88 vette that I just gave to my sister.The cold start should not be an issue it you plug it somehow, Maybe the 89 gaskets will seal it off. I don't know what the triangle cutout is for. I gave all of my repair manual to the new car owner.
cel

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.