when i put the second set of gaskets in,i did loosen up the heat box bolts joining the two manifolds,tightened the manifolds to the head,then tightened the heat box back up.im not sure,but im pretty sure that the manifold on there is the one that came with the engine.i have pictures of the engine the day i got it with the manifold on it.i just need to see if theres something on there to tell me that its the same one that i cleaned,painted,and put back on.
http://i612.photobucket.com/albums/tt202/dantheman176/261straightsix003.jpg
http://i612.photobucket.com/albums/tt202/dantheman176/261straightsix002.jpg

1949 Chevy 6400
In the Gallery
Photobucket pictures