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Hello
Yes thats right the 4 Valve technology pushed to watercooling.
Some 4 V air cooled heads where produced using a alcohol filled heat pipe system to transfer the heat around the centersparkplug to the outside.
But watercooled heads where simpler ( cheaper to produce ) and more reliable. Also some other issues like noise and interiour heating wher to expensive to be managed aircooled for the nowerdays new car buyers.
However i think CMW has 4V heads for Porsches.
Not to forget the idear to use a full ceramic head with ceramic valves.
Grüsse
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