Technical Installation Guide · BMW N54B30 · ARP2000
Kit contents, torque specifications, tightening sequence, installation procedure and the High Boost corner-hole conversion for the EPOXY54 N54 ARP2000 Head Stud Kit.
95 ft-lb11 mm studs, final
129 Nm · 3 steps
129 Nm · 3 steps
45 ft-lb9 mm studs, final
61 Nm · Standard kit
61 Nm · Standard kit
14Stud positions
Center-out sequence
Center-out sequence
M11×1.5Block thread
All 14 on High Boost
All 14 on High Boost
Fig. 1 — Tightening sequence, block deck top view
Know your kit
Two versions of the N54 ARP2000 kit exist. Both replace the 14 factory torque-to-yield head bolts (BMW 11 12 7 574 303). The difference is the four outer corner positions.
| Standard | High Boost | |
|---|---|---|
| Studs | 10 × 11 mm + 4 × 9 mm | 14 × 11 mm |
| Nuts / washers | 10 + 4 matched sets | 14 matched sets |
| Lubricant | ARP Ultra-Torque included | ARP Ultra-Torque included |
| Block machining | None — threads into factory holes | Drill & tap 4 outer M9 holes to M11 (see section 06) |
| Final torque | 11 mm: 95 ft-lb · 9 mm: 45 ft-lb | All 14: 95 ft-lb |
| Use when | The block can't be machined, or engine stays in the car. Still good for 30+ psi. | Recommended whenever the outer holes can be drilled and tapped — strongest clamp at the block ends. |
11 mm stud9 mm stud
11 mm studDrilled & tapped
Why the corners matter
The factory N54 uses 10 large M11 bolts between and beside the cylinders, plus 4 smaller M9 bolts at the block ends. High-power builds have reported head lift at the end cylinders, next to the M9 positions. Upgrading only the inner 10 to studs still leaves the corners as the weakest clamp — which is what the High Boost kit fixes.
Fitment (N54B30)
- 2007–2010 E82/E88 135i
- 2011–2012 E82 1M Coupe
- 2007–2010 E90/E91/E92/E93 335i
- 2011–2013 E92/E93 335is
- 2008–2010 E60/E61 535i
- 2009–2012 F01/F02 740i / 740Li
- 2008–2010 E71 X6 xDrive35i
- 2009–2016 E89 Z4 sDrive35i / 35is
- Alpina B3 Bi-Turbo / B3 S Bi-Turbo
Not for N55The N55 uses its own stud kit. Don't mix parts between platforms.
Torque specifications
Values below are for ARP2000 studs with ARP Ultra-Torque on the nut threads and nut face. Engine oil or other lubes give different friction and clamp load — ARP doesn't publish values for them.
ARP stud kit — step table
| Step | 11 mm studs (positions 1–10, all 14 on High Boost) | 9 mm studs (11–14, Standard kit) |
|---|---|---|
| 1 | 30 ft-lb (41 Nm) | 15 ft-lb (20 Nm) |
| 2 | 60 ft-lb (81 Nm) | 30 ft-lb (41 Nm) |
| 3 · Final | 95 ft-lb (129 Nm) | 45 ft-lb (61 Nm) |
Run each step through the full 1 → 14 sequence before moving to the next step. The 9 mm final value (45 ft-lb) is the published kit spec; 15/30 ft-lb are the “three equal steps” ARP calls for. Some vendors quote metric equivalents of 130 Nm (11 mm) and 60 Nm (9 mm) — the same targets, rounded.
Factory bolts — for reference only
| Factory fastener (BMW TIS) | Spec |
|---|---|
| Head bolts 1–10, M11 × 135 | 30 Nm → 90° → 90° → 45° |
| Head bolts 11–14, M9 × 95 / M9 × 125 | 30 Nm → 90° → (skip) → 45° |
| Chain-case head bolts, M9 × 30 / M9 × 70 | 22 Nm (16 ft-lb) — always new |
Never mix methodsTorque-angle values are for new factory TTY bolts only. ARP studs are tightened to torque, never torque-plus-angle. Factory bolts can't be reused.
Don't forget the chain-case boltsThe kit replaces the 14 main head bolts only. The small head-to-block bolts in the timing-chain tunnel stay factory: fit new ones and torque to 22 Nm after the studs are done. Hold the lowest one with a magnet or grabber so it can't drop into the chain case.
Tightening sequence
Center-out, alternating diagonally across the bores. This pattern squeezes the gasket evenly from the middle toward the ends so the head can't rock or trap a high spot.
11 mm stud9 mm stud (Standard kit) — 11 mm on High Boost
| Order | Where |
|---|---|
| 1 & 2 | Center pair, between cylinders 3 and 4 — diagonally opposite |
| 3 & 4 | One cylinder out from center |
| 5 & 6 | Opposite side of center, one cylinder out |
| 7 & 8 | Two cylinders out |
| 9 & 10 | Two cylinders out, opposite end |
| 11 & 12 | Block ends — 9 mm on Standard kit |
| 13 & 14 | Block ends — 9 mm on Standard kit |
How to run it
- Step 1 torque on every stud, 1 → 14.
- Step 2 torque on every stud, 1 → 14.
- Step 3 (final) on every stud, 1 → 14.
- Go around once more at final torque, 1 → 14, to confirm none moved.
OrientationShown as published on the ARP kit card. The pattern is diagonally symmetric: turn it 180° and each stud swaps only with its pair partner (1↔2, 3↔4 …). You torque the same pairs in the same order from either side of the engine.
Standard kitThe 9 mm studs (11–14) get their own lower values at each step — 15, 30, then 45 ft-lb. Set the wrench before you reach them so they never see 11 mm torque.
Installation procedure
Head off, deck bare and clean. Work through every step in order — most stud-kit problems trace back to dirty threads or the wrong lube.
Block & hardware prep
- Clean every thread. Run an M11×1.5 thread chaser (not a cutting tap) through the 10 inner holes; M9×1.25 on the corners for the Standard kit.
- Empty the blind holes. Blow out debris, coolant, oil and water with solvent and compressed air. Liquid trapped under a stud can hydraulic-lock and crack the block.
- Clean the sealing faces with plastic scrapers — no abrasive discs or metal-cutting tools on the aluminium deck or head.
- Inspect the kit. Check every stud, nut and washer for damage; sort 9 mm and 11 mm parts on the Standard kit.
- Thread studs in hand tight with a light film of lube, using the hex in the stud end. Snug only (≈10 Nm max). If one binds, back it out and chase again.
- Check stud heights. The ten inner studs should stand within about ±0.3 mm of each other. A tall one isn't bottomed.
Head & torque
- Fit the new gasket dry on the deck, without bending it. Don't add sealant.
- Lower the head straight down over the studs and check nothing binds.
- Degrease the washer seats on the head. Fit washers chamfer up, dry on the underside.
- Lube the nuts. Ultra-Torque on the upper stud threads and the nut face. Run nuts down hand tight.
- Torque in sequence — three steps, full 1 → 14 pattern each time, then a confirm pass at final (sections 02–03).
- Chain-case bolts: new OEM M9 bolts at 22 Nm.
- Re-check cold after the first heat cycle if your kit card or gasket maker asks for it (see below).
Heat cycle & re-torqueARP's position: with correct prep and Ultra-Torque, a re-torque isn't needed unless your gasket maker calls for one. Several kit cards add a check: warm to operating temperature, hold a few minutes, let it cool fully, then re-torque to final spec in sequence. Never re-torque a warm engine.
Head gasket choiceOEM-style MLS, Cometic MLX and cut-ring gaskets are all used on stud-kit N54s. Gaskets differ in bore size, thickness (compression) and whether they suit O-rings or receiver grooves. Follow the gasket maker's surface-finish and re-torque requirements.
Lube & hardware: what goes where
ARP's torque values only hold if the friction is right. Lube the surfaces that turn against each other; keep the washer seat on the head dry.
| Surface | Treatment |
|---|---|
| Block threads | Clean, dry hole; light film only |
| Stud into block | Hand tight, fully bottomed |
| Upper stud threads | Ultra-Torque |
| Nut face on washer | Ultra-Torque |
| Washer on head | Dry, degreased |
| Washer orientation | Chamfer up |
Thread sealer?BMW treats the N54 head-bolt holes as blind pocket holes that must be clean and dry, so the kit is installed with Ultra-Torque. ARP thread sealer is only for holes that break into a water jacket. Never use Ultra-Torque and sealer/Loctite on the same thread, and never Loctite the nuts.
ReuseARP studs can be torqued and reused. Replace any stud or nut with galled, damaged or corroded threads. Factory head bolts are torque-to-yield and are never reused.
High Boost: corner conversion
Convert the four outer M9 × 1.25 holes (positions 11–14) to M11 × 1.5 so all 14 positions take the same 11 mm stud and the same 95 ft-lb.
| Item | Spec |
|---|---|
| Factory corner thread | M9 × 1.25 |
| Target thread | M11 × 1.5 — matches the 10 inner holes |
| Tap drill | 9.5 mm (standard tap drill for M11 × 1.5) |
| Taps | M11 × 1.5 taper/plug to start, bottoming tap to finish the blind hole |
| Depth | Full thread for the stud's block-end thread length (measure the stud and an inner hole). Don't go past factory hole depth without a machinist's OK. |
Process
- Bare deck, block on a stand or in a machine. Engine-in-car tapping is not recommended.
- Use a drill guide bushing or fixture located off the deck so each hole stays square.
- Drill in stages to 9.5 mm with cutting fluid for aluminium; clear chips often.
- Tap with frequent back-outs; finish with the bottoming tap.
- Wash out every chip — oil galleries and water jackets included — then chase all 14 holes.
- Test-fit an 11 mm stud in each corner; check its height against the inner studs.
Get it checked firstHave a machinist look at the block before drilling. Casting thickness and core shift vary, and a crooked or over-deep hole can crack the block or break into a coolant passage.
Check the head holes tooThe head's four outer holes were sized for M9 bolts. Test-fit before final assembly: the 11 mm stud must pass freely and the washer must sit flat. Some installers open these holes up — that's a job for the machine shop.
Thread insertsStainless insert kits exist for the N54 head-stud holes (all 14, or the 10 M11 holes) for repairs or extra thread strength. Follow the insert maker's drill and tap specs — they're different from the plain M11 conversion.
Tools, checklist & mistakes to avoid
Tools & consumables
- Calibrated click torque wrench (20–150 ft-lb)
- 12-point socket to suit the ARP nuts
- Hex key for the stud ends
- M11×1.5 thread chaser (+ M9×1.25 for Standard)
- ARP Ultra-Torque (included)
- Brake cleaner / degreaser, compressed air
- Plastic gasket scrapers
- New head gasket
- New OEM chain-case head bolts
- High Boost: 9.5 mm drill, drill guide, M11×1.5 taps, cutting fluid
Final check before the cam covers go on
- Every hole chased, blown out and dry
- All studs bottomed, heights checked
- Washers chamfer up, dry underneath
- Ultra-Torque on stud threads and nut faces only
- Three steps, full sequence each step
- 9 mm studs at 9 mm values (Standard)
- Final confirm pass at 95 / 45 ft-lb
- Chain-case bolts in at 22 Nm
- Nothing dropped into the chain case
Common mistakes
| Mistake | Why it hurts |
|---|---|
| Cleaning threads with a cutting tap | Removes aluminium and weakens the thread. Use a chaser. |
| Torquing studs into the block | Pre-loads the block threads before the head is clamped. Studs go in hand tight only. |
| Oil or coolant left in a blind hole | Hydraulic lock as the stud goes in — risk of cracking the block. |
| Motor oil instead of Ultra-Torque | Higher, inconsistent friction: the wrench clicks at 95 but the clamp load is lower and uneven. |
| Lube on the washer's underside | Washer can spin against the head and change the torque reading. Keep that face dry. |
| 9 mm studs taken to 95 ft-lb | Overloads the smaller stud and the M9 block thread. |
| Using torque-angle on studs | Angle specs are for factory TTY bolts only. |
Build-order tip: EPOXY54 + studsIf you're filling the block with EPOXY54, do it while the deck is bare: any corner drilling and tapping first, then the pour, 24-hour cure, coolant-passage drilling and solute flush. Dry and re-clean every stud hole after the flush, then install the studs. Fill must stop about 0.5 mm below the deck so the head gasket can seal.
This guide is a reference, not a replacement for the instruction card in your kit or a qualified engine builder. If your kit's printed instructions differ, follow the kit. Block machining is done at the installer's own risk. ARP, Ultra-Torque and the ARP logo are trademarks of Automotive Racing Products, Inc.
N54 ARP2000 Head Stud Kit
Standard or High Boost, ARP Ultra-Torque included.