head casting number 4772576?

What does the rest of the chamber look like? Interesting they only lengthened the exh pushrod hole, and into the valve cover flange. If I have a problem, it's usually the other side of the pushrod hole, because the higher ratio brings the pushrod seat on the rocker closer to the shaft. The spring seats are still only for single springs, I'd like to see a performance head have the seat flat for doubles. I think the numbers are good, but I dont think a gasket match will bring much over that .500 lift figure if the short turn is as deep as you say. Can you take some clearer pics of the ports them selves? and the full chamber? I'm curious what an open chamber 63cc deal looks like... that one looks just as deep as a typical LA chamber. They look a lot like "587s" with bigger valves. Down to the AIR hole flanges. Are these sold as bare castings only, or are they available as assemblies too? Money wise, after stock type valves, springs, retainers, locks, and seals, you are even with Edelbrocks. Step up to stainless valves and lighter stuff like what comes on Edelbrocks, and you're over them.