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 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). 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!
Premium parallel ground washers are also included with each kit.
Application | Hex Nuts | 12-Point Nuts | 12-Point Nuts U/Cut Studs |
---|---|---|---|
BMC/TRIUMPH | |||
A-series, 9 studs | 206-4201 | ||
A-series, 11 studs | 206-4204 | ||
A-series, 11 studs, shaved head | 206-4206 | ||
B-series | 206-4202 | ||
Triumph GT6 | 206-4205 | ||
Triumph Spitfire | 206-4203 | ||
Triumph TR4 | 206-4207 | ||
Triumph TR7 | 206-4208 | ||
BMC E46 M3/S54 12pt head stud kit | 201-4303 | ||
BMW | |||
2002, 318I, 320I | 201-4601 | ||
535, 635, 735 | 201-4602 | ||
M50, S50, S50US, 2.5L 6-cylinder | 201-4603 | ||
M3, E46, S54 | 201-4604 | ||
Mini Cooper | 201-4301 | ||
FORD, 4 and 6-CYLINDER | |||
2.0L Zetec | 251-4702 | ||
2.3L Duratec 2003 | 151-4204 | ||
2.5L Duratech V-6 | 253-4701 | ||
Cosworth Sierra/Escort (12mm) | 251-4701 | ||
Escort 1600cc, 10mm | 151-4203 | ||
Pinto 2000cc | 151-4201 | ||
Pinto 2300cc | 151-4202 | 151-4702 | |
GM | |||
2.2 Ecotech | 231-4701 | ||
HOLDEN | |||
308, 7/16" | 254-4009 | 205-4602 | |
308, 1/2" | 234-4201 | ||
308 V8 | 205-4001 | 205-4601 | |
Commodore V-6, 7/16" | 205-4002 | ||
HONDA/ACURA | |||
B18A1, M11 | 208-4302 | ||
VTEC B18CI, M11, GSR | 208-4303 | ||
B16A | 208-4601 | ||
B20B, w/B16A head | 208-4306 | ||
Civic D16Y | 208-4305 | ||
D16Z - Only, M10 | 208-4301 | ||
K20A (A2 & A3) | 208-4701 | ||
H22A4, VTEC | 208-4304 | ||
H23A | 208-4307 | ||
MAZDA | |||
Miata | 218-4701 | ||
2.3L, DOHC, 16V, 2003 | 218-4702 | ||
2.0L, FS-DE, '98-'02 | 218-4703 | ||
2.5L (KLSeries) V6 head stud kit | 218-4704" | ||
MITSUBISHI | |||
2.0L, 4-cylinder, 16 valve, M12, 4G63 up to 1994 | 207-4201 | 207-4701 | |
2.0L, 4-cylinder, 16 valve, M11, 4G63 1994 to 2006 2G Eclipse, Evo 8/9 | 207-4203 | 207-4702 | |
2.0L (4B11) turbo head stud kit Evo X | 207-4206 | ||
2.6L 4-cylinder | 207-4202 | ||
6G72, DOHC, 16V 2003 | 207-4205 | ||
NISSAN | |||
L20 series, 4-cylinder | 202-4201 | ||
A-12 engines | 202-4202 | ||
A-14 engines | 202-4203 | ||
L24, L26, L28 series, 6-cylinder | 202-4206 | ||
GTR, RB26, DETT, ARP2000 | 202-4207 | ||
SR20, DET (VC) | 102-4701 | ||
CA18DE, CA18DET | 202-4702 | ||
RB20, RB20DET, RB25, RB25DET | 202-4301 | ||
VQ35 | 202-4701 | ||
RN14, SR20DET | 202-4303 | ||
PORSCHE | |||
911, premium austenitic studs - Dilvar replacement | 204-4206 | ||
SATURN | |||
1.9L, SOHC, '99-'02 | 165-4201 | ||
1.9L, DOHC, '91-'99 | 165-4202 | ||
SUBARU | |||
2.0L, 2.2L, 2.5L, EJ Series, DOHC, up to '98 | 260-4701 | ||
EJ Series, Phase II, '99-present, SOHC | 260-4702 | ||
TOYOTA | |||
22R | 203-4201 | ||
7M GTE-Supra, 5MGE | 203-4202 | 203-4701 | |
4AG, 16 valve | 203-4203 | ||
3SGTE | 203-4204 | ||
2JZA80 Supra | 203-4205 | 203-4702 | |
VAUXHALL/OPEL | |||
2.0L, 16 valve | 209-4301 | 209-4701 | |
Opel 2.5L, V6 | 209-4302 | 209-4702 | |
VOLKSWAGEN/AUDI | |||
Super Vee | 204-4202 | ||
Golf/Jetta, 1.8L & 2L, 8 valve | 204-4203 | 204-4701 | |
Golf/Jetta, 1.8L & 2L, 16 valve | 204-4204 | 204-4702 | |
Audi 5 cylinder, 10 valve | 204-4205 | 204-4703 | |
Audi 5 cylinder, 20 valve | 204-4207 | 204-4704 | |
VR6 | 204-4705 |