Back in early March of this year, I was helping a friend go through a semi-trailer full of flathead stuff that hadn't been opened up since 1991. In the mix of stuff I brought home, there were two Thickstun manifolds, one PM-7 high rise and one much lower and with different runners. The short one is definitely a Thickstun as the name is cast into it. I'm sure it's not a cut down PM-7 as nothing that would identify it has been ground off. After trying to research it, I can't find any information on it at all. I know that Thickstun made some one off's and some short production runs. In the pics you can see the differences in not only the runners but the generator mount. PM-7 is in the background in second picture. Does anyone have an idea what this manifold is?