I am setting up the carb.side of a 1926 engine with parts from the heap, from which I extracted these three exhaust manifolds:
The top one and the bottom one are easily identifiable -(the top one being 1909-12 stamped T-511)- but what is the middle one? - It seems to be somewhat shorter than the bottom one.
Center manifold is '25-'27.
The notch depression at the 4th port near the exit is the giveaway for these years.
Thanks Dan - most helpful - Niels