Good question. I don't know. Even the valve seats are a different color between exh and intake. I suppose I put my faith in the Chapman people knowing what they're doing. If these heads had come out of a 'mystery' shop, I'd be a lot more concerned but at the time, anyway, Chapman was considered top shelf. They still might be, I dunno. I've done some additional machining in non-performance affected areas and now I just need to order the valve springs and retainers to be done.
On these heads, I added some external drain lines that will reduce puddling of oil around the valve pockets. Without these drains (which will connect near the top rail of the oil pan) quite a bit of oil will sit until it reaches a level that allow it to run back through the lifter valley. By using the drain lines, the oil will stay away from the lifter valley altogether.
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