BMW 530, 535, 635, 735, 12-point nuts and under cut studs, ARP Head Studs 201-4602ARP Head Stud Kits with 12-point Nuts and Under Cut Studs. It is for good reason that virtually every top professional engine builder relies on ARP head studs for their all-out competition powerplants.
Bord size 95,6mm
TH. - 2mm