I started trying to fit my new exhaust manifold today, above was the starting position.
I started by removing the 02 sensor a step which probably doesn't apply to many 50 year old Datsuns
I soon had the inlet manifold complete with carbs off as one assembly.
I cut through the old exhaust for easier removal.
Then the old manifold was off and you can clearly see why it needs to be replaced.
Then the "fun" started, I knew it wasn't to be a cake walk when I had to remove the thermostat housing which the old exhaust had cleared easily when being removed. And then it wouldn't clear past some bolts which were holding on a what I think is called an idler arm, something to do with the steering anyway so I undid the nuts and pulled the bolts part way out to get it past. I will be able to get the nuts back on afterwards.
Then the corner of the transmission was in the way of the 2-1 collector pipe fitting but this bit seemed superfluous.....
So I cut it off.
Finally I was at a point where it was basically fitting, well the manifold at least but there was still a clearance issue with the 2-1 collector pipe and the transmission oil pan.
Welcome to the inside of my transmission, I removed the pan to make sure the 2-1 collector would fit if the pan were modified and as far as I can tell it will. That's where I got to today.
My plan of action now is to get the inlet manifold back on and get the engine side of things all back together and also reinstall the transmission oil pan for now and treat it as a partial ATF change. Then I will need to modify the oil pan before I can install the 2-1 collector. I have a few concerns/thoughts I need to mull over. So maybe some transmissions "gurus" (@PhilA) could give some input please. Number one is the depth of a transmission oil pan critical? I will have to make it deeper in another area so I don't lose any volume. Number two, will it matter if the exhaust is close to the pan once modified? I am worried about the extra heat although it does an ATF cooler as part of the radiator. Number three, would anyone near Tamworth be prepared to modify the pan for me? I have a welder which works and has gas but I am not really confident using it. I will have a go if I need to but would rather trust someone else if they were confident of doing it. I know oil pans get modified all the time when people do engine swaps so I am pretty sure it's doable.
I maybe should have bought a different manifold but I am determined to make this work now so here's hoping