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After examining the valves and seats before and after lapping, the exhausts were in better condition than the inlets and the contact area was larger.
The anti-lag had caused no damage which means we must have set it up well.
As for the guide issue, its not such a problem with a rocker less cam setup like the RB's. Although the cam does slide over the bucket, that can only move up and down. So the only force on the valve is along its stroke.
On the ehaust side, the valves are IIRC sodium filled. If you run a pointed valve guide, the narrowest part must get very hot, which I don't want.
I want the gas to heat as little as possable on the was out, hence flush grinding the guides.
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