Yes. Take the valve cover off, pull all hoses, and the manifold is attached to the block with a series of studs. Maybe leave the valve cover on so you don't get scuzz into the rockers, but you have to take it off to lift the manifold. Maybe 5 bolts, with one on each end and 3 in the middle? Back out the nuts from above as far as you can and it will lift off with the heat exchanger attached. You should probably get to Northwoods Tractor and get a new manifold gasket. I don't know where you get the gaskets where the heat exchanger attaches to the manifold - you may have to cut them.
I sprayed mine w/PB blaster some for a couple days ahead, and tried to clean the threads so I wouldn't be backing the studs out. I don't think there are HOLES for those studs in the manifold, as I recall, they're just u-shaped so you can lift the manifold straight up and off. Do some 20# curls each arm for a few days ahead of time.
I bought a new heat exchanger from Mr. Cool and a gasket set from Northwoods. You may be able to get just the manifold gasket, but I wanted to replace the valve cover gasket and some others as well. I'm going to have to cut new gaskets for the heat exchanger attachment.
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