The photos of the porting is from the Butch Pace head that started the thread. Butch Pace was a racer/distributor, race shop associated with RC in St Louis in the mid/late 70s. His porting is reportedly from the same patterns used at RC that Byron developed in the early 70s(it sure looks like it anyway). Mike opened the intake for 33.5 intake valves (it was an 836 bore size race head), and he had free reign to improve the porting as he saw fit. You'd have to ask him how much playing around he did. The rest of the head got new EVERYTHING. To say I was pleased with all the work done would be a huge understatement.
The latest head in process (slow process, no hurry) is also a vintage race head, this one with a cool history. It was in FAR worse shape. I can clearly recall Mike shaking his head in defiance, or sheer bewilderment (hard to tell), at the idea of repairing that old war horse. He and I stared at it at his shop, and it appears to have been beaten, repaired, raced, beaten, repaired, raced hard,(repeat a few more times), busted badly, then retired in a very sad state. It was WAY past the point of being "worth repairing given it's condition", but I'm stubborn, and this head is special.
Unfortunately for Mike, I'll be sending that head his way to perform a few more miracles at some point. Assuming he doesn't get smart and refuse my business anyway
George