Re: New heads
That seat is toast, don't try to run it like that! Lapping that seat will NOT clean that up! It's right smack dab in the middle of the 45° cut.
You'll either have to (A) sink the valve job to clean that up (BAD idea!), (B) have seats installed (another bad idea as discussed earlier) or (C) have the seats cut for bigger valves.
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