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Don't forget the 2.1 RSR turbo... IIRC from P Frere's book (the porsche 911 story) it used the 2.x heads and used a 47 mm intake and a 40.5 mm exhaust valve. It is listed with 43 mm ports. I figure this was as big as it got with the 2.x heads. If porsche had used 2.8RSR heads for this motor, it just would have had the 'big valves' - but as it doesn't...
As I have been chasing up this tree myself, it really seems to be the only option short of trying to use 3.0+L parts.
So my next 'cataloge search' was going to be for 47 mm valves with 1mm thinner stems (a al 935) if I can find them.
tadd
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1967 912 with centerlocks… 10 years and still in pieces!
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