Couple of pictures below of one I just finished for another guy. The lighting in my shop makes the casting look yellow, but really its not. Also please excuse the one hole that I didn't get deburred yet on the closeup of the port. The pushrod tubes are 3/4" OD 0.062" wall aluminum. I squeeze them in a vise onto an arbor with the correct oval shape, then use the arbor to pound them into place in the pushrod holes. They are a very tight fit, and I also used green Loctite on the top and bottom to keep them in place. Also the top of the pushrod tube holes have some reliefs in either side, so I can stake the top of the pushrod tube in place there. I just don't like the idea of those tubes coming out
You probably can't see it from the photos but the ports are indeed widened out around the pushrod tubes, to increase the port area to compensate for the presence of the tube. I just copied the Ford dimensions for that bulge. Since the ports were mostly round, they were actually pretty easy to program compared to the 351C to FE ports on the high riser and medium riser intake adapters. I did need a special tool, a ball-end mill with a 1" ball on the end of a 3/8" shaft, to bulge out the port around the pushrod tube. If I only had a 5 axis machine...
I did update the intake adapter thread in the Vendor Classifieds with some verbage about these, but haven't posted pictures yet. I'll get some better pictures in the next few days and post them there also.
By the way Thor, guess who's manifold I'm working on now?