I am going to need to make a custom 4 into 1 exhaust system for my O-360 powered Acrosport II. I just can't bring myself to give someone else $1500 to do it. Anyway, I was wondering if anyone had dimensions for the locations of all of the exhaust port studs on the engine. That way, I can make a simple fixture here at the shop to weld this thing up on. The TIG welder that I will be using is not very portableA 3D cad model of an O-360 would be great, but I know that's a long shot.