Have a friend who needs an exhaust manifold for an
early 80's Dodge van (198). I have some off earlier
170 & 225's. Would they interchange? Ed P.

EdPed@thegrid.com

yes

See if the truck has an O2 sensor, some of the real late exhaust manifolds had a tapped hole on the back wall of the heat riser area. Another problem area is the choke pocket but if you have the choke stove for the replacement manifold, you can get around that issue.

As far as "bolting-on", yes, it will bolt onto the head.
DD