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23 We’re also upgrading the fasteners to high-quality ARP head bolts to help the head gaskets do their job. The ARP bolts are highly engineered fasteners. For example, transition to the underside of the head of the bolt isn’t a sharp corner but is rounded for added strength. To go with that, the washers have a chamfered edge on one side. This edge should always face against the underside of the head of the bolt to provide proper clearance. ARP also provides a special lubricant to apply to both sides of the washers to keep the surfaces of the bolt and the head from galling together and throw off your torque readings.