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Kind of on the fence about selling these- been thinking of porting a 405, seeing what it might bring on ebay or Tbricks, but I know I probably won't get to it, and with properly done seats and valves, probably wouldn't be profitable, so first $40 takes.
Long version:
Yeah, you can go to somewhat oversize valves on stock seats.
With these, the idea is you still have lots of seat material (thermal stability for good sealing and lessened chance of drop out, ...and... there are reasons to believe these are picked for correct fit into the casting, and decent performance useage durability
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