poolboy said:
I think there may be more to this.
You could be right, but there was a lot of binding going on, and the possibility that the actual valve lash was set way large (due to the binding). A judgement call, I agree. But if it were my engine, I would at least try the old rocker assembly before pulling the head off to check the valve stems & guides. Wouldn't hurt to squirt some penetrating oil on the valve stems while the shaft is off, since they are certainly too dry at this point.
And for long-term, yes, I would have RAS go over the mess and see what they can make out of it. A quick check of prices @ TRF shows that 7 rockers & a shaft will set you back over $200, which ISTR is more than I paid RAS to rebuild my (4 cylinder) shaft. Of course that was a few years back, so their price may have gone up. But that way, they check out all the rockers to be sure they are OK, plus I believe they will rebush them to better than new. It's at least worth giving them a call, IMO. There was clearly something wrong with the rocker assembly, but at this point you don't know if the rockers were bored undersize or the shaft was too large (in addition to the holes being in the wrong place).
Also, while it is a long shot, I'd still give BPNW a call and ask if they can help. I've never had a problem with them myself, but I've heard that their customer service is excellent. And the shaft they supplied was clearly just as defective a year ago as it is today, the problem is just a bit more obvious now!