Doing some re-painting this week on my engine bay to clean up.. It's time to mod the heater box. I need to figure out how to cut off the air portion of the box and retain heat/defrost. I know you guys know of threads that can help, I am just not having much luck coming up with anything.

 

Nothing from this thread working out for you ?
https://ls1tech.com/forums/forced-in...rbo-build.html