Today's puzzle. I have two s20 exhaust manifolds, which to my eye appear to be meant for the C10 GTR models. One of them has been shortened, i'm guessing for use in a Z432. Since I don't have an original-looking Z432 S20 exhaust manifold on my Z432, I thought it would be a suitable exercise to get this manifold re-flanged for use in a Z432. At the same time, I'd replace the one section of pipe that has somehow been squashed.
Not entirely sure of the origin of these manifolds. Any thoughts as to where they might have come from? The pipes appear to be stainless. The cut unit appears to have a custom mounting bracket, which I'm guessing by it's position was mounted onto a custom bracket off of the bell housing/rear of engine block. The bracket does not appear to be aligned with anything I can see on my cars.
What I'd like to know is the horizontal distance between the last bolt-hole on the exhaust port and the exhaust pipe flange. In other words, how far back from the rear-most bolt hole is the flange located, in order to properly bolt up to a standard exhaust setup? If anyone has a part that's out of the car (even an aftermarket bolt-up part will hopefully have the same dimension) this would be a straightforward exercise, and I'd be grateful.