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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). 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. (More Below) |
| Part # | Chrysler 4-Cylinder | Price | |
|---|---|---|---|
| 241-4501 | Chrysler 2.2L 4-cylinder M11 hex undercut hsk | $108.67 | |
| 241-4701 | Chrysler 2.2L 4-cylinder M11 12pt undercut hsk | $118.75 | |
| 141-4202 | Dodge Neon DOHC up to '03 head stud kit | $119.12 | |
| 141-4203 | Dodge Neon SOHC head stud kit | $133.97 | |
| Part # | Chrysler 6-Cylinder | Price | |
| 142-4001 | Chrysler cast iron SL6 head stud kit | $97.29 | |
| 207-4205 | Mitsubishi/Dodge 6G72 DOHC ARP2000 head stud kit | $347.01 | |
| Part # | Chrysler Small Block | Price | |
| 144-4004 | SB Chrysler, w/B1-BS heads, head stud kit | $138.74 | |
| 144-4204 | SB Chrysler, w/B1-BS heads, 12pt head stud kit | $176.98 | |
| 144-4001 | Mopar head stud kit | $118.31 | |
| 144-4201 | Mopar 12pt head stud kit | $171.76 | |
| 144-4002 | Mopar w/W2-cylinder head stud kit | $134.56 | |
| 144-4202 | Mopar w/W2-cylinder 12pt head stud kit | $173.06 | |
| 144-4003 | Mopar w/W5-cylinder head stud kit | $142.19 | |
| 144-4203 | Mopar w/W5-cylinder 12pt head stud kit | $180.55 | |
| 144-4005 | SB Chrysler Performer RPM head stud kit | $116.29 | |
| 144-4205 | SB Chrylser 360 magnum 12pt head stud kit | $173.55 | |
| Part # | Chrysler Big Block | Price | |
| 145-4001 | SB Chrysler 392 Hemi head stud kit | $147.27 | |
| 145-4201 | SB Chrysler 392 Hemi 12pt head stud kit | $238.78 | |
| 145-4003 | 426 Hemi 7/16 in. head stud kit | $211.17 | |
| 245-4203 | 426 Hemi 7/16 in. 12pt head stud kit | $205.60 | |
| 145-4002 | 426 Hemi 1/2 in. head stud kit | $210.96 | |
| 245-4202 | 426 Hemi 1/2 in. 12pt head stud kit | $256.14 | |
| 145-4011 | Chrysler 440 Indy cylinder 12pt head stud kit | $176.78 | |
| 245-4311 | Chrysler Indy 440 cylinder 12pt head stud kit | $198.29 | |
| 245-4306 | KB Hemi Inner head stud kit | $55.38 | |
| 245-4308 | KB Hemi short deck 1/2 in. 12pt head stud kit | $636.64 | |
| 245-4005 | KB Hemi standard deck 1/2 in. head stud kit | $523.51 | |
| 245-4305 | KB Hemi standard deck 1/2 in. 12pt head stud kit | $669.00 | |
| 245-4309 | KB Hemi long deck 1/2 in. 12pt head stud kit | $701.42 | |
| 245-4310 | KB Hemi 9/16 in. 12pt head stud kit | $516.04 | |
| 245-4710 | KB Hemi 9/16 in. undercut 12pt head stud kit | $687.30 | |
| 145-4007 | Mopar B & RB wedge B1 head stud kit | $177.65 | |
| 245-4307 | Mopar B & RB wedge, w/B-1 heads, head stud kit | $230.09 | |
| 145-4006 | Mopar B & RB wedge head stud kit | $173.66 | |
| 145-4206 | Mopar B, RB & 413-426 wedge 12pt head stud kit | $204.76 | |
| 145-4012 | Mopar Koffel BTS head stud kit | $167.10 | |
| Part # | 12-Cylinder | Price | |
| 247-4201 | Dodge Viper '96-'03 GEN II head stud kit | $355.58 | |
| Part # | Chrysler/Cummins Diesel | Price | |
| 247-4203 | Dodge Cummins 5.9L 12V '94-'98 head stud kit | $445.12 | |
| 247-4202 | Dodge Cummins 5.9L 24V '98-'06 head stud kit | $438.51 |
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 head stud kits are available for most every domestic and import applications. 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.