Thanks a bunch Cotten,
This info is great as it gives me some idea just how much smaller everything was on the 741. I am not proposing to make this thing into an all out beast, but it does give me some sensible sizes to aim at where and if needs be.
I reakon I can easily push the 741 inlet manifold from its present 13/16th (approx) out to around 1.1 inches, but it will require a custom inlet manifold and a bit of thought for the way it is attached to the threaded nipple on the barrel. (Probably the easiest way will be to make up a threaded packer to take a larger manifold nut).
I have to nut out if I am going to retain the M741 Linkert or go for a bigger one. At the moment I am looking at keeping it and installing a 'Thirty Fifty/841 HDA', 13/16 venturi. One advantage with the limitations of the 741 barrels is that stroking them, smaller carbs are not all bad news as piston speeds are not increased and there is a longer time for the induction and exhaust strokes.
This is the reason why I am keen to find out the nominal internal size of the SS inlet manifold, so I can make a more informed decision in this area, so if anyone out there can measure an old barrel they may have lying around, it would be very much appreciated.
As I say, I am still at the stage where I have yet to take a deep breath before I decide in which direction I will move with all this stuff. I know that keeping it all 741 standard is the safe way to go, but thats not in my nature, especially as I used to have a little single seat race car...I just gotta fiddle!
Thanks again to all that have and continue to answer my many questions.