what kinda measurements are you looking for? the diameters and the distances to the corner and stuff? I'm at college til friday, but when i made my manifold, the puter diameter is .750" (3/4") and i driled out the inner diameter to .65625" (21/32") I'm not sure on the distances to the inside edges, though. and the inside drill could prob. be a little smaller if wanted, because with this setup i used, i only had about .050" wall thickness, which isn't much, but gets the job done. You could also use probably a 5/8" (.625") inner diameter if you wanted it to be a little strudier with 1/16" (.0625") wall thickness. when i get home, i'll get you the rest of the measurements off the stock chrome manifold. what exactly are you trying to do as a casting?