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ARP Bolt

ARP Bolts - Head Studs

arp head studs

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.


ApplicationHex Nuts12-Point Nuts12-Point Nuts U/Cut Studs
BMC/TRIUMPH
A-series, 9 studs206-4201
A-series, 11 studs206-4204
A-series, 11 studs, shaved head206-4206
B-series206-4202
Triumph GT6206-4205
Triumph Spitfire206-4203
Triumph TR4206-4207
Triumph TR7206-4208
BMC E46 M3/S54 12pt head stud kit201-4303
BMW
2002, 318I, 320I201-4601
535, 635, 735201-4602
M50, S50, S50US, 2.5L 6-cylinder201-4603
M3, E46, S54201-4604
Mini Cooper201-4301
FORD, 4 and 6-CYLINDER
2.0L Zetec251-4702
2.3L Duratec 2003151-4204
2.5L Duratech V-6253-4701
Cosworth Sierra/Escort (12mm)251-4701
Escort 1600cc, 10mm151-4203
Pinto 2000cc151-4201
Pinto 2300cc151-4202151-4702
GM
2.2 Ecotech231-4701
HOLDEN
308, 7/16"254-4009205-4602
308, 1/2"234-4201
308 V8205-4001205-4601
Commodore V-6, 7/16"205-4002
HONDA/ACURA
B18A1, M11208-4302
VTEC B18CI, M11, GSR208-4303
B16A208-4601
B20B, w/B16A head208-4306
Civic D16Y208-4305
D16Z - Only, M10208-4301
K20A (A2 & A3)208-4701
H22A4, VTEC208-4304
H23A208-4307
MAZDA
Miata218-4701
2.3L, DOHC, 16V, 2003218-4702
2.0L, FS-DE, '98-'02218-4703
2.5L (KLSeries) V6 head stud kit218-4704"
MITSUBISHI
2.0L, 4-cylinder, 16 valve, M12, 4G63 up to 1994207-4201207-4701
2.0L, 4-cylinder, 16 valve, M11, 4G63 1994 to 2006 2G Eclipse, Evo 8/9207-4203207-4702
2.0L (4B11) turbo head stud kit Evo X207-4206
2.6L 4-cylinder207-4202
6G72, DOHC, 16V 2003207-4205
NISSAN
L20 series, 4-cylinder202-4201
A-12 engines202-4202
A-14 engines202-4203
L24, L26, L28 series, 6-cylinder202-4206
GTR, RB26, DETT, ARP2000202-4207
SR20, DET (VC)102-4701
CA18DE, CA18DET202-4702
RB20, RB20DET, RB25, RB25DET202-4301
VQ35202-4701
RN14, SR20DET202-4303
PORSCHE
911, premium austenitic studs - Dilvar replacement204-4206
SATURN
1.9L, SOHC, '99-'02165-4201
1.9L, DOHC, '91-'99165-4202
SUBARU
2.0L, 2.2L, 2.5L, EJ Series, DOHC, up to '98260-4701
EJ Series, Phase II, '99-present, SOHC260-4702
TOYOTA
22R203-4201
7M GTE-Supra, 5MGE203-4202203-4701
4AG, 16 valve203-4203
3SGTE203-4204
2JZA80 Supra203-4205203-4702
VAUXHALL/OPEL
2.0L, 16 valve209-4301209-4701
Opel 2.5L, V6209-4302209-4702
VOLKSWAGEN/AUDI
Super Vee204-4202
Golf/Jetta, 1.8L & 2L, 8 valve204-4203204-4701
Golf/Jetta, 1.8L & 2L, 16 valve204-4204204-4702
Audi 5 cylinder, 10 valve204-4205204-4703
Audi 5 cylinder, 20 valve204-4207204-4704
VR6204-4705
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