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If you're going to bore the rockers out, what would you use as a reference to keep everything square?



"bore" is probably the wrong term to use. You would either ream them or hone them out. Either way, it would be self-centering on the current bore. If you want to get into optimizing the ratio ... well, good luck with that.



When I said bore I meant "material removal". Boring .030" using a boring head on a mill is easy. You could also use a reamer, but if your hole is off or crooked compared to the rest of the rocker a reamer won't fix that, it'll follow the existing hole, whereas a single point tool in a boring head won't, it will cut true. Good luck honing .060" out, hope you have alot of time to waste on your hands.



I think building a jig and trying to correct geometry would be a much greater waste of time. In the end you'll just be older with a little more self-satisfaction but no performance gain. And you'd be surprised how fast a hone will cut those cast rockers !!!