ARP (207-4702) Mitsubishi 4G63 M11 Head Stud Kit

Why Upgrade to Head Studs?

Factory head bolts:

• Stretch under high boost

• Lose clamping force

• Can contribute to head gasket failure

ARP head studs provide:

• Superior clamping strength

• Even load distribution

• Improved head gasket sealing

• Reusability in many cases

On a boosted 4G63, it’s cheap insurance.

(12 Point Nut – Uncut Studs) Built for the (03-07) Mitsubishi EVO… 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.

Key Features

• ARP high-strength fastener material

• M11 configuration

• Precision rolled threads

• Heat-treated for durability

• Designed for turbocharged 4G63 applications

• Includes washers and nuts

Translation: serious clamping power.

That’s why ARP head studs are popular among leading Sport Compact/Import racers.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).

Ideal Applications

Commonly used on:

• Mitsubishi Lancer Evolution

• Mitsubishi Eclipse

• Other 4G63 turbo platforms

Perfect for:

• Upgraded turbo setups

• Built engines

• MLS head gasket installs

• Track and drag builds

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!