Head stud kits
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You should know that ARP® 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 ground—the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP® studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned—something that won't happen with inferior quality head studs.

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.

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—one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing!
Image Product Compatibility Price (Inc. GST)
ARP head stud kit. 12 point nuts and ground washers are included.
207-4203
Mitsubishi - Evolution 4 (CN9A)
Mitsubishi - Evolution 5 (CP9A)
Mitsubishi - Evolution 6 (CP9A)
Mitsubishi - Evolution 7 (CT9A)
Mitsubishi - Evolution 8 (CT9A)
Mitsubishi - Evolution 9 (CT9A)
$239.00
8-14 days [via Japan]
ARP head stud kit. 12 point nuts and ground washers are included.
207-4206
Mitsubishi - Evolution 10 (CZ4A)
$225.00
8-14 days [via Japan]
ARP custom aged 625+ head studs.Centerless ground, heat treated prior, nominally rated at 270,000psi
207-4302
Mitsubishi - Evolution 7 (CT9A)
Mitsubishi - Evolution 8 (CT9A)
Mitsubishi - Evolution 9 (CT9A)
$449.00
In stock now [Perth]
 
Image SKU Product Compatibility
207-4203 ARP head stud kit. 12 point nuts and ground washers are included. Mitsubishi - Evolution 4 (CN9A)
Mitsubishi - Evolution 5 (CP9A)
Mitsubishi - Evolution 6 (CP9A)
Mitsubishi - Evolution 7 (CT9A)
Mitsubishi - Evolution 8 (CT9A)
Mitsubishi - Evolution 9 (CT9A)
207-4206 ARP head stud kit. 12 point nuts and ground washers are included. Mitsubishi - Evolution 10 (CZ4A)
207-4302 ARP custom aged 625+ head studs.Centerless ground, heat treated prior, nominally rated at 270,000psi Mitsubishi - Evolution 7 (CT9A)
Mitsubishi - Evolution 8 (CT9A)
Mitsubishi - Evolution 9 (CT9A)
Image SKU Product Loyalty Points
207-4203 ARP head stud kit. 12 point nuts and ground washers are included. 0
207-4206 ARP head stud kit. 12 point nuts and ground washers are included. 0
207-4302 ARP custom aged 625+ head studs.Centerless ground, heat treated prior, nominally rated at 270,000psi 0