OE Ford Head Bolts to Suit the RS and ST225 – Pumaspeed
- Full Set of 12 Head Bolts
All our engines use ARP bolt where possible ! They are essential for long life in extreme conditions.
Obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines employing high compression pistons or power adders like turbochargers, nitrous oxide and superchargers. That’s why ARPÂ® head studs are popular among leading Sport Compact/Import racers.
You should know that ARPÂ® uses a premium grade 8740 alloy that is rated far superior to “aircraft” quality. Then, each stud is precisely heat-treated to 200,000 psi. Following heattreat, 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 groundâ€”the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARPÂ® studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly alignedâ€”something that won’t happen with inferior quality head studs.
ARPÂ® 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.
You will also note that ARPÂ® 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 forceâ€”one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing! Premium parallel ground washers are also included with each kit.
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