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Part No: 206-4201
If your high compression, or high RPM motor blows head gaskets or blows coolant, it is likely that the head studs are not keeping enough torque pressure on the cylinder head. You can only re-torque a stud so often before they stretch and lose strength! These ARP studs are manufactured of high grade steel: they don't stretch so you pull the head down not the stud up. 9 stud kit with special machined washers and 12pt. nuts are included to increase torque accuracy through better engagement. Rocker studs and nuts are also included. (As a point of reference, the cost of this kit is less than stock studs alone!) Studs can be torqued to 65ft/lbs with oil, 55ft/lbs with the included ARP assembly lube.
See our part# L99 for ARP Lube.
Watch out for ARP kits sold under this part number, but equipped instead with cheaper 6 point nuts!
ARP Hardware Mini Cooper
World-leading Fastener Technology
ARP started applying technology to race fastener design and manufacturing in 1968. We'll discuss five components of fastener technology in detail.
Today's critical diesel fasteners - head studs and bolts, main studs and bolts, and driveline - have been designed stronger than ever before to handle the extreme loads. As a results, installation pre-loads - the amount the fastener is stretched during installation - are very high.
There are three methods that can be employed to determine how much tension is exerted on a fastener; using a torque wrench, measuring the amount of stretch, and turning the fastener a pre-determined amount (torque angle). Of these methods, use of a stretch gauge is the most accurate.
The following material is intended to provide a brief overview of the metallurgical considerations that influence the design and production of the most reliable fasteners in motorsports. It is hoped that a simple understanding of the knowledge and commitment required to produce this reliability will make your future fastener decisions much, much easier.
The materials ARP uses in fastener manufacturing are listed and compared.
Recognizing Common Failures
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.
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