Thanks- I remember the article now that I see it. Corky was one of the premier porters back in the 70's and early 80's, Elkins at Diamond was at the top of the heap.

Note the 1.81" exhaust valve, we used those back in the mid 70's - cutting the maxwedge 1.88" down. I sold of bunch of those Stage IV heads back in the day that Corky did for me. Wish I had saved a few sets.