ARP’s rugged, black-oxide coated chromemoly intake manifold bolts are rated at 170,000 psi. They’re precision-machined for optimum thread engagement and have a wide-area flange for better load distribution. They also feature precision-rolled threads, which prevent galling, while promoting more consistent torque loading. These bolts are available with either hex or 12-point heads, and washers are included.
ARP also offers stainless steel intake manifold bolts, which share all the same features as their chromemoly cousins, but are 15 percent stronger than Grade 8 steel bolts. These bolts are both corrosion and heat-resistant and come highly polished.
ARP chromemoly and stainless steel intake bolts are both available in either hex head or 12-point head, and include washers.