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Competition head stud kit (11 studs, nuts & washers). Also includes rocker studs nuts and washers.
This special kit was developed to replace the increasingly inconsistent standard items. The studs are manufactured in selected hi-grade steel and produced to exacting specifications. These studs do not stretch, so they pull the head down, not the thread up; this vastly increases head gasket life, even on high compression engines. Special thick washers, countersunk on one side, help clamping capability and reduce thread bottoming of the nuts. The 12 point skirted nuts help to increase torque accuracy through better engagement. Note that even replacing the head bolt with a stud, only torque that stud to the factory recommended spec(25 ft/lbs), the other studs can be torqued to 65ft/lbs with oil, 55ft/lbs with ARP lube. (Rocker studs 25/20)
ARP Hardware Mini Cooper
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ARP started applying technology to race fastener design and manufacturing in 1968. We'll discuss five components of fastener technology in detail.
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The materials ARP uses in fastener manufacturing are listed and compared.
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There are six types of metallurgical failures that affect fasteners. Each type has unique identifying physical characteristics. The following examples are designed to be used like a spark plug reading chart to help analyze fastener failures.