Head stud option for the stock N9T** engines. ARP Porsche 944 combo solution:   ARP studs, Porsche 944 Turbo OEM head stud nuts (V-M's recipe) ARP 204-4211 Porsche 944 head stud kit.  (10x 7.700" head stud with washers) Porsche OEM Cylinder Head Nut 999 076 043 02 Recipe: Install the studs upside down with M12x1.25 threads into block ARP kit comes with the washers Stock 944 Turbo nuts thread onto the M12x1.5