150hp 1.9 PD has stronger head bolts than smaller powered 1.9 PD engines.
Bold grade is 12.9 and it has higher tensile strength than lesser powered engines bolts, giving more clamping force to prevent head lift and gasket leak when cylinder pressures raise from stock.
When combined with Victor Reinc head gasket, offers good durability even with 300+hp engines.
Note: Can be cut down to VE head bolt length.
