Hi
Looking to replace the choke heat tubes on my 289 - I cant find the chapter in the shop manual that covers that ?
How are the tubes fastened in the heat exchanger on the exhaut manifold ? I cant see anything and yet they wont move.
Thanks
Not sure if 289 is the same as my 390. On the 390 they are just pushed in to the stop ridges on the tubes. Probably some corrosion holding yours in.
This article might help you-
choke-stove-rebuild.pdf (628 KB)
OK, I didnt want to use The Force prematurely ! 
Great rebuild document.
You will want to remove the manifold from the engine to rebuild the hot air chamber. It’s a bit of a chore.
A piece of copper tubing with a compression fitting on the choke end works. Just get a diameter to stick into the heat pipe in the manifold.
Update - the tube broke when I tried to pull it with pliers so I ended up having to drill it out. Lucky enough my drill was small enough to fit in without having to remove anything. I blew some compressed air on the other end to clean it up. I was able to replace it using the kit I bought from WCCC. Was extremely fiddly as the compression fitting is really hard to line up and it really wants to cross thread (which was the reason I wanted to change it - previous owner had made a huge mess out of it and didn’t want to damage the thread on the carb with the old nut) so I ended up tightening the nut first and then jamming the other end into the choke stove. I didn’t replace the inlet tube which didn’t cause me any trouble in the first place. If it ain’t broke i’d rather not touch it.
Even with the new tube, the choke just wouldn’t open. Turns out when rebuilding the carb I had put the thermostatic spring the other way around - so the more it heated up, the more it would try to close … fixed that … now it all works ! well it runs terrible still but that’s progress !
Yay !
That sounds pretty good. You will have to experiment with the choke setting and also the fast idle cam adjustment to get it working properly. As the temperature changes you will find that the choke adjustment needs a bit of tweaking to compensate, particularly when it gets warmer in the spring time.
Certainly correct to match the original heat tube choke with an Autolite carb, but I gave up and went with an Holley 2v/electric choke. Runs great with better performance at 500cfm - just have to remember to turn OFF the ignition key so that the choke will reset. In a 351W I also moved the ignition coil to the rear of the engine for better gas line routing…
Just an option.