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911 valve seat dimension


Vehicle Information: Model: 911t; Year: 1972; Body Type: Targa; Engine (type, size, modifications): 2.4 with Webers; Total Mileage: 47000;

I am re building a 2.7 litre motor.I need to know what the width of the 45 degree portion of the valve seats should measure. I find the measurement for the earlier cars in the factory shop manual listed as 1.25mm is it the same for the 74?.Also the intake valve guides appear to be made out of a copper material. I plan to replace,but what is this?thanks.

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