ARP BMW MINI Cooper Head Stud Kit - Gen 1 Petrol Models
With our ever increasing search for more power and revs, the strain inflicted by the internal engine components is immense. As more engines are being subjected to the strain of high compression pistons, turbochargers, supercharges and nitrous oxide the need for greater reliability will take affect. It is at this stage imperative to achieve perfect cylinder head to engine block sealing. Automotive Racing Products (ARP) introduced their ARP BMW Mini Head Stud Kit which is made using a premium grade 8740 alloy chrome moly steel. As a testament to their superior quality you will find that gaskets and cylinder heads literally glide into position and are perfectly aligned, something that won't happen with inferior quality head studs; not even possible with bolts.
It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there’s not a better stud setup on the market today. For openers, ARP uses a premium grade 8740 alloy that is rated far superior to “aircraft” quality. Then, each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best. Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It’s important to note that lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine).
ARP studs are thread rolled after heat-treat, which gives them about 1000% (that’s ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it’s tough on tooling, but the results are well worth the extra effort. You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the “stretch” of both studs, which makes for a more consistent clamping force – and one that compensates for head gasket compression when the cylinder heads are installed. This helps prevent blown head gaskets, and assures optimum engine sealing!
Premium quality heat-treated 8740 chrome moly steel ARP head stud kits are available for most domestic and import applications. Please contact us in you need a kit not listed. You won’t find a better quality stud on the market from any other source. Look for ARP stamped on each stud as your assurance of quality. Clearly, they are the best on the market today, and the favourite of leading professional engine builders in all forms of racing. ARP’s customer list reads like a “who’s who” of motorsport from around the world. These include NASCAR Winston Cup, CART, Formula 1, NHRA Top Fuel, Funny Car, Pro Stock, NASCAR Busch Series and Craftsman Truck Series.
ARP Fastener Benefits:
- Forged in-house at ARP using only the finest quality materials.
- Heat-treated using special vertical racks to assure complete 360° penetration.
- Threads rolled after heat-treat to provide up to 10-times longer fatigue strength.
- Precision CNC-machined to exacting specifications.
- Specially designed for optimum reliability in each application.