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If you haven't done so, I'd suggest that you get a copy of Jim Kartalamakis's Alfa Romeo DOHC Engine High Performance Manual. He's done a lot of work developing 2L Alfa engines. He has a great section in his book on cylinder head porting and makes some specific comments on using 8mm valves.
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Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
'62, Lancia Flaminia Zagato3c, 2nd series
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