Why Engine Internal Parts Represent the Highest-Margin Category in Korean Car Aftermarket
Engine internal components — cylinder blocks, cylinder heads, head gaskets and oil pumps — occupy a unique position in the automotive aftermarket. Unlike consumables such as brake pads or filters, these parts are purchased only when an engine suffers catastrophic failure or when a rebuild shop undertakes a full overhaul. The result is lower transaction frequency but substantially higher per-unit value and margin. A single Hyundai Tucson 2.0L cylinder head wholesale order can exceed US$800 in value. A cylinder block for a Kia Sorento 2.4L can reach US$1,200–$1,800. For distributors serving the Middle East, Africa and Southeast Asia, where vehicle replacement cycles stretch to 15–20 years, engine rebuilds are a routine service rather than an exception.
Hyundai and Kia collectively sold over 7.3 million vehicles globally in 2024, with the G4NA (2.0L), G4KD (2.4L), Gamma (1.6L) and Nu (1.8L/2.0L) engine families powering the majority of passenger cars and compact SUVs. As these engines pass 150,000–250,000 km in high-mileage markets, three failure modes dominate: (1) cylinder head warpage from overheating, (2) head gasket breach due to thermal cycling, and (3) oil pump pressure loss from balance-shaft bearing wear. Each failure requires replacement of the corresponding major component — and each represents a high-value wholesale opportunity.
Kingmay Auto Parts stocks OEM-grade and genuine MOBIS engine internal components for all four engine families. All castings are sourced from IATF 16949-certified foundries with documented material certifications (ASTM A48 grey iron for cast-iron blocks, A380.0 aluminium alloy for aluminium heads). This article provides the technical specifications, OE reference numbers, wholesale pricing and quality verification procedures that professional buyers need.
Cylinder Block: Cast-Iron vs Aluminium, Bore Specs and OE Manufacturing Standards
The cylinder block is the structural foundation of the engine. Hyundai-Kia uses two primary materials across its passenger-car engine range: cast iron for older and heavy-duty applications (early G4KD, some diesel variants) and aluminium alloy for modern lightweight designs (G4NA, Gamma, Nu). The choice of material affects thermal expansion rates, machining tolerances and compatibility with cylinder liners.
Engine Family Application Matrix
| Engine Code | Displacement | Block Material | Bore × Stroke | Primary Applications | Global Install Base |
|---|---|---|---|---|---|
| Gamma G4FA | 1.6L | Aluminium (A380.0) | 77.0 × 85.4 mm | Kia Rio, Hyundai Accent, Kia Soul | ~4.2M units |
| Nu G4NB | 1.8L | Aluminium (A380.0) | 81.0 × 87.0 mm | Hyundai Elantra, Kia Cerato | ~3.8M units |
| Nu G4NA | 2.0L | Aluminium (A380.0) | 81.0 × 97.0 mm | Hyundai Tucson, Kia Sportage, Hyundai Sonata | ~5.5M units |
| Theta II G4KD | 2.4L | Aluminium (A380.0) | 88.0 × 97.0 mm | Kia Sorento, Hyundai Santa Fe, Kia Optima | ~4.1M units |
| Gamma G4FC | 1.6L | Aluminium (A380.0) | 77.0 × 85.4 mm | Hyundai i30, Kia Ceed | ~2.9M units |
Data: Hyundai-Kia global production records 2010–2024. Aluminium blocks account for 94% of passenger-car engine production; cast-iron blocks are limited to commercial vehicle and early diesel applications. All modern Hyundai-Kia petrol engines use open-deck aluminium blocks with cast-in iron cylinder liners.
Critical Dimensional Specifications
Wholesale buyers of cylinder blocks must verify four critical dimensions before accepting shipment:
- Cylinder bore diameter: Must match OE specification within ±0.01 mm. Over-bore blocks (+0.25 mm, +0.50 mm) are available for rebuild applications where the original bore has been damaged by piston seizure or scuffing.
- Deck flatness: Maximum allowable warpage is 0.05 mm across the entire deck surface. Blocks exceeding this limit will not seal correctly with MLS head gaskets and require resurfacing (minimum cut 0.10 mm).
- Main bearing bore alignment: The five main bearing saddles must be co-linear within 0.02 mm. Misalignment causes crankshaft binding, premature bearing wear and oil pressure loss.
- Camshaft bore alignment (in head): For DOHC heads, the camshaft journals must be co-linear within 0.015 mm to prevent cam binding and valvetrain noise.
Block Supply Options
| Grade | Description | FOB Price (G4NA 2.0L) | MOQ | Warranty |
|---|---|---|---|---|
| MOBIS Genuine New | Brand-new casting from Hyundai Mobis foundry, complete with main bearings, freeze plugs and gallery plugs | US$1,250–$1,450 | 1 unit | 24 months / 40,000 km |
| OEM-Grade New Casting | New casting from IATF 16949-certified Tier 1 foundry (same material spec, same machining tolerances), bare block without bearings | US$680–$890 | 1 unit | 12 months / 20,000 km |
| OEM-Grade Reconditioned | Used core inspected, bored/honed to standard or +0.25 mm, deck resurfaced, main line align-honed | US$420–$580 | 1 unit | 6 months / 10,000 km |
Cylinder Head: DOHC Architecture, Valve Train and Camshaft Integration
All modern Hyundai-Kia petrol engines use a dual overhead camshaft (DOHC) cylinder head design with four valves per cylinder. The cylinder head is the most complex and highest-value individual component in the engine. It houses the combustion chambers, valve seats, camshaft journals, spark plug bores, intake/exhaust ports and the variable valve timing (VVT) oil control valve galleries.
Head Specifications by Engine Family
| Engine | Head Material | Valves/Cyl | VVT System | Combustion Chamber | Intake Port Shape |
|---|---|---|---|---|---|
| Gamma G4FA 1.6L | A319.0 aluminium | 4 (2I/2E) | CVVT (intake only) | Pentroof, 34.5 cc | Tumble-port (high swirl) |
| Nu G4NA 2.0L | A319.0 aluminium | 4 (2I/2E) | D-CVVT (dual) | Pentroof, 38.2 cc | Tumble-port |
| Theta II G4KD 2.4L | A319.0 aluminium | 4 (2I/2E) | D-CVVT (dual) | Pentroof, 41.5 cc | Tumble-port with dual runners |
Common Cylinder Head Failure Modes
- Warping from overheating: The most common failure. When coolant loss causes temperature spikes above 120 °C, aluminium heads warp across the deck surface. Warpage exceeding 0.10 mm is generally non-repairable — the head must be replaced.
- Cracked combustion chamber: Pre-ignition or detonation (often from low-octane fuel in hot climates) can crack the chamber wall between the intake and exhaust valves. Cracks visible under Magnaflux inspection require head replacement.
- Worn camshaft journals: Oil starvation or extended oil-change intervals cause journal scoring. Journal diameter must be within +0.00/−0.025 mm of nominal. Excessive wear requires line-boring (if possible) or head replacement.
- Stripped spark plug threads: Over-torquing or cross-threading during service strips the aluminium threads. Thread inserts (Heli-Coil, Time-Sert) are a repair option, but for wholesale supply, replacement heads are preferred.
Cylinder Head Supply Grades
| Grade | Contents | FOB Price (G4NA 2.0L) | MOQ |
|---|---|---|---|
| MOBIS Genuine — Bare Head | Head casting only, no valves, springs, cams or VVT gear | US$680–$820 | 1 unit |
| MOBIS Genuine — Complete Head | Head with valves, springs, retainers, seals, cams, VVT phasers and oil control valves installed | US$950–$1,100 | 1 unit |
| OEM-Grade New — Bare Head | New casting from certified foundry, machined to OE tolerances, valve seats pre-installed | US$380–$520 | 1 unit |
| OEM-Grade Reconditioned | Core head inspected, deck resurfaced, valve seats recut, new valve guides, pressure-tested | US$280–$380 | 1 unit |
Cylinder Head Gasket: MLS Multi-Layer Steel vs Composite, Torque Specs and Failure Prevention
The cylinder head gasket is the most critical seal in the engine. It must contain combustion pressures exceeding 120 bar (1,740 psi), resist coolant temperatures up to 130 °C, and tolerate the differential thermal expansion between the aluminium head and the aluminium or cast-iron block. A failed head gasket allows coolant into the combustion chamber (white smoke, coolant loss), combustion gas into the coolant (overheating, pressurised expansion tank) or oil into the coolant (milky residue).
MLS vs Composite: Technical Comparison
| Property | MLS (Multi-Layer Steel) | Composite (Graphite/Asbestos-Free) |
|---|---|---|
| Construction | 2–5 layers of spring stainless steel with elastomer coating | Compressed fibre core with steel fire rings |
| Thickness recovery | Elastic — returns to original thickness after thermal cycling | Plastic deformation — permanent compression set over time |
| Blow-out resistance | Excellent — embossed steel fire rings contain combustion pressure | Good — dependent on clamping load and surface finish |
| Surface finish requirement | Ra 1.0–1.6 μm (smoother) | Ra 2.0–3.5 μm (rougher acceptable) |
| Retorque required | No — maintains clamping force through elastic recovery | Recommended at 1,000 km and 5,000 km |
| Reusability | Not recommended — elastic limit reached after first use | Never reusable |
| Typical lifespan | 200,000+ km in normal service | 120,000–150,000 km |
| Price (wholesale FOB) | US$18–$28 (genuine MOBIS) | US$8–$15 (aftermarket composite) |
Critical Installation Notes for Wholesale Buyers
Head gasket failure in the field is rarely caused by the gasket itself — it is caused by improper installation. Rebuild shops buying wholesale from Kingmay Auto Parts receive a printed installation guide with every gasket order. Key points:
- Deck and head surface finish: Both surfaces must be clean, flat and within Ra 1.6 μm. Any scoring, pitting or corrosion above 0.05 mm depth requires resurfacing.
- Torque sequence: Hyundai-Kia specifies a centre-outward spiral torque sequence (typically 10 stages). Skipping stages or torquing in the wrong order causes uneven clamping and immediate gasket failure.
- Torque-to-yield (TTY) bolts: Most modern Hyundai-Kia engines use TTY head bolts that stretch permanently during installation. These bolts cannot be reused. Kingmay supplies genuine TTY bolt sets (OE reference 22321-2B000 series) with every gasket order.
- Coolant chemistry: Silicate-based coolants (green, traditional) are incompatible with MLS gasket coatings. Only OAT (organic acid technology) or HOAT (hybrid OAT) coolants meeting Hyundai/Kia specification MS 591-08 should be used.
Head Gasket OE Reference Numbers
| OE Reference | Engine | Gasket Type | Bore Diameter | Thickness | FOB Price | MOQ |
|---|---|---|---|---|---|---|
| 22311-2B000 | G4NA 2.0L | MLS 3-layer | 81.0 mm | 1.20 mm | US$18–$28 | 20 pcs |
| 22311-2G000 | G4KD 2.4L | MLS 3-layer | 88.0 mm | 1.25 mm | US$22–$32 | 20 pcs |
| 22311-2B100 | Gamma 1.6L | MLS 3-layer | 77.0 mm | 1.15 mm | US$14–$22 | 20 pcs |
| 22311-2E000 | Nu 1.8L | MLS 3-layer | 81.0 mm | 1.18 mm | US$16–$25 | 20 pcs |
All MLS gaskets are genuine MOBIS or OEM-Grade equivalent (same 301 stainless steel substrate, same Viton elastomer coating, same embossing die geometry). Composite aftermarket gaskets are available at 40% lower price but are not recommended for turbocharged or high-compression applications.
Oil Pump Assembly: Balance-Shaft-Integrated Design, Pressure Curves and Common Faults
The oil pump in Hyundai-Kia engines is not a standalone component — it is integrated with the balance shaft module on most 4-cylinder designs. This integration reduces parts count and assembly time but means that balance-shaft bearing wear directly affects oil pump performance. Low oil pressure at idle (below 1.0 bar / 14.5 psi when hot) is the most common symptom, followed by valvetrain noise (ticking from hydraulic lash adjusters) and VVT system fault codes.
Oil Pump Specifications
| Parameter | G4NA 2.0L | G4KD 2.4L | Gamma 1.6L |
|---|---|---|---|
| Pump type | Gerotor (internal-external rotor) | Gerotor | Gerotor |
| Displacement | 28.0 cc/rev | 32.5 cc/rev | 22.0 cc/rev |
| Relief valve opening | 4.5–5.2 bar (65–75 psi) | 4.5–5.2 bar | 4.2–4.8 bar |
| Normal hot idle pressure | 1.0–1.5 bar (14–22 psi) | 1.0–1.5 bar | 1.0–1.4 bar |
| Normal hot 3,000 rpm pressure | 2.5–3.5 bar (36–51 psi) | 2.5–3.5 bar | 2.2–3.2 bar |
| Drive method | Chain from crankshaft | Chain | Chain |
| Balance shafts | Yes (2 shafts, 2 bearings each) | Yes | Yes |
Common Oil Pump / Balance Shaft Failure Modes
- Balance shaft bearing wear: The balance shaft bearings are plain bearings (sleeve bearings) machined directly into the aluminium pump housing. When oil change intervals are extended beyond 10,000 km with low-quality oil, the bearing surfaces score and clearances increase. Clearance exceeding 0.10 mm causes pressure loss and chain rattle.
- Relief valve sticking: The spring-loaded ball valve can stick in the open position due to sludge or debris, causing permanently low pressure. In the closed position, it causes excessive pressure that damages oil seals.
- Gerotor wear: The inner and outer rotors are precision-matched pairs. Wear at the rotor tips reduces pump displacement. Rotor tip clearance must be below 0.15 mm.
- Chain stretch: The balance shaft drive chain stretches over 150,000+ km, causing timing errors between the balance shafts and crankshaft. This increases second-order vibration and accelerates bearing wear.
OE Part Numbers and FOB Wholesale Price Reference
The following table summarises the core engine internal parts stocked by Kingmay Auto Parts for wholesale export. All prices are FOB Nansha / Guangzhou, Q2 2026. MOQs are flexible for established buyers.
| # | Component | OE Reference | Engine | Grade | FOB Price | MOQ |
|---|---|---|---|---|---|---|
| 1 | Cylinder Block — Bare (new casting) | 21100-2E000 | G4NA 2.0L | OEM-Grade New | US$680–$890 | 1 unit |
| 2 | Cylinder Block — Complete (genuine) | 21100-2E000 | G4NA 2.0L | MOBIS Genuine | US$1,250–$1,450 | 1 unit |
| 3 | Cylinder Block — Reconditioned | 21100-2E000 | G4NA 2.0L | OEM-Grade Recon | US$420–$580 | 1 unit |
| 4 | Cylinder Head — Bare (new casting) | 22100-2E000 | G4NA 2.0L | OEM-Grade New | US$380–$520 | 1 unit |
| 5 | Cylinder Head — Complete (genuine) | 22100-2E010 | G4NA 2.0L | MOBIS Genuine | US$950–$1,100 | 1 unit |
| 6 | Cylinder Head — Reconditioned | 22100-2E000 | G4NA 2.0L | OEM-Grade Recon | US$280–$380 | 1 unit |
| 7 | Head Gasket — MLS (genuine) | 22311-2B000 | G4NA 2.0L | MOBIS Genuine | US$18–$28 | 20 pcs |
| 8 | Head Gasket — MLS (OEM-Grade) | 22311-2B000 | G4NA 2.0L | OEM-Grade | US$12–$18 | 20 pcs |
| 9 | Head Gasket — MLS (genuine) | 22311-2G000 | G4KD 2.4L | MOBIS Genuine | US$22–$32 | 20 pcs |
| 10 | Head Bolt Set — TTY (genuine) | 22321-2B000 | G4NA 2.0L | MOBIS Genuine | US$28–$42 | 10 sets |
| 11 | Oil Pump Assembly — Complete | 21310-2E000 | G4NA 2.0L | OEM-Grade | US$85–$120 | 5 units |
| 12 | Oil Pump Assembly — Genuine | 21310-2E000 | G4NA 2.0L | MOBIS Genuine | US$130–$160 | 5 units |
| 13 | Balance Shaft Chain Kit | 24321-2E000 | G4NA 2.0L | OEM-Grade | US$32–$48 | 10 sets |
| 14 | Main Bearing Set (std) | 21020-2E000 | G4NA 2.0L | OEM-Grade | US$28–$42 | 10 sets |
| 15 | Con Rod Bearing Set (std) | 23060-2E000 | G4NA 2.0L | OEM-Grade | US$22–$35 | 10 sets |
Prices valid Q2 2026, FOB Nansha / Guangzhou. Block and head prices vary by engine code — G4KD 2.4L and G4KE 2.0L Turbo are 15–25% higher than G4NA 2.0L due to larger casting size and lower production volume. Volume discounts available for orders exceeding 5 units (blocks/heads) or 100 pcs (gaskets). Contact ku@kingmay-autoparts.com for formal quotation.
MOBIS Genuine vs OEM-Grade vs Aftermarket: A Three-Tier Quality Framework
| Grade | Source | Material Cert | Price vs MOBIS | Warranty | Best For |
|---|---|---|---|---|---|
| MOBIS Genuine | Hyundai Mobis or Tier 1 contracted foundry (Hyundai Steel, SeAH Changwon) | Full mill cert, IATF 16949, OEM QMS | 100% (baseline) | 24 months / 40,000 km | Warranty dealers, premium rebuild shops, government fleet contracts |
| OEM-Grade | IATF 16949-certified independent foundry (same ASTM/AISI material spec, same CMM inspection) | Material cert, dimensional report, pressure test cert | 55–70% | 12 months / 20,000 km | Independent repair chains, volume rebuild shops, export distributors |
| Aftermarket Generic | Unverified foundry (often grey-market) | Self-certified or none | 30–45% | 3–6 months or none | Not recommended for engine internals — high failure risk, no traceability |
Kingmay Auto Parts supplies MOBIS Genuine and OEM-Grade engine internal components only. Every block and head shipment includes:
- Dimensional inspection report (bore diameter, deck flatness, main bore alignment)
- Material composition certificate (spectrography for aluminium alloy or grey iron)
- Pressure test certificate (heads only — 5.0 bar air pressure, 30 seconds, no leakage)
- Hardness test report (HB 170–220 for grey iron, HB 90–110 for aluminium)
- Packing list with OE reference numbers, engine codes and serial numbers
Shipping Heavy Engine Castings: Crating, Moisture Protection and HS Codes
Engine blocks and cylinder heads are the heaviest and most fragile auto parts to ship. A bare G4NA block weighs 28–32 kg; a complete cylinder head weighs 14–18 kg. Incorrect packaging causes corner damage, deck surface scratching or bore contamination that renders the part unusable.
Packaging Specification
- Inner protection: VCI (vapor corrosion inhibitor) film wrap + 2× 200g silica gel desiccant packs. All machined surfaces (deck, bores, journals) are coated with rust-preventive oil (ISO VG 32, military spec MIL-PRF-16173).
- Intermediate layer: Custom-cut polyethylene foam inserts cradle the block in six axes — preventing movement within the crate.
- Outer crate: ISPM-15 certified plywood, 18 mm thickness, steel banding at corners. Crate dimensions: 600 × 450 × 400 mm (block) | 520 × 380 × 320 mm (head).
- Labeling: Fragile, This Side Up, Net/Gross weight, OE reference, engine code, HS code 8409.91, country of origin (China).
Shipping Costs
| Destination | Port | Transit | Freight (per 100 kg) | Freight (20' FCL) |
|---|---|---|---|---|
| Jeddah (Saudi Arabia) | RoRo / container | 18–22 days | US$45–$65 | US$1,800–$2,400 |
| Jebel Ali (UAE) | Container | 15–20 days | US$40–$58 | US$1,600–$2,200 |
| Mombasa (Kenya) | Container | 22–28 days | US$55–$78 | US$2,200–$3,000 |
| Lagos (Nigeria) | Container | 28–35 days | US$62–$88 | US$2,500–$3,400 |
| Almaty (Kazakhstan) | Rail | 14–18 days | US$85–$120 | US$3,200–$4,200 |
Freight rates Q2 2026. LCL (less-than-container-load) rates are per 100 kg gross weight including crate. FCL rates are for a full 20-foot container (max 21,000 kg). Marine insurance at 0.35% of CIF value is included in all Kingmay quotations.
HS Codes: Cylinder blocks and heads — 8409.91 (parts suitable for use solely or principally with internal combustion piston engines). Oil pump assemblies — 8413.30 (fuel, lubricating or cooling medium pumps for internal combustion piston engines). Head gaskets — 8484.10 (gaskets and similar joints of metal sheeting combined with other material). Correct HS classification ensures accurate duty calculation and prevents customs delays.
FAQ: Sourcing Hyundai/Kia Engine Internal Parts from China
- Q1: How do I verify that a cylinder block is compatible with my target engine code?
- Always cross-reference the engine code stamped on the original block (located on the block deck, near the transmission mating surface) with the OE reference number in the parts catalogue. The G4NA, G4NB, G4KD and G4KE blocks are visually similar but have different bore diameters, deck heights and oil gallery routing. Kingmay provides a VIN-based parts lookup service — send the vehicle VIN or engine serial number to ku@kingmay-autoparts.com and we will confirm the correct block, head and gasket part numbers within 4 hours.
- Q2: Can I order a cylinder head without valves and camshafts, or only as a complete assembly?
- Both options are available. Bare heads (casting with valve seats installed, no valves/springs/cams) are preferred by professional rebuild shops that have their own valve grinding and seat cutting equipment. Complete heads (with all valvetrain components, cams and VVT phasers pre-installed) are preferred by general repair garages that do not have cylinder head machining capability. Complete heads cost 35–50% more but save 4–6 hours of labour per unit.
- Q3: What is the difference between a reconditioned block and a new casting?
- A reconditioned block is a used core that has been inspected, bored/honed to standard or oversize, deck resurfaced and main line align-honed. It is suitable for budget rebuilds but carries a shorter warranty (6 months). A new casting is a virgin block from the foundry with no prior service history — it offers the longest service life and full warranty (12–24 months). For fleet operators and warranty shops, new castings are strongly recommended. For independent rebuild shops serving price-sensitive markets, reconditioned blocks offer acceptable quality at 40% lower cost.
- Q4: Do you supply oversize pistons and rings to match over-bore blocks?
- Yes. Kingmay stocks oversize pistons and rings in +0.25 mm, +0.50 mm and +1.00 mm for all four engine families. Piston sets include pistons, rings, wrist pins and circlips. OE references: 23410-2E000 (G4NA std), 23410-2E010 (+0.25), 23410-2E020 (+0.50). FOB US$85–$140/set. MOQ 5 sets. Piston rings are available separately: 23040-2E000 (compression + oil control, std size). FOB US$18–$28/set. MOQ 10 sets.
- Q5: How do I prevent head gasket failure in hot-climate markets?
- Three measures: (1) Use only MLS gaskets — never composite gaskets in high-temperature markets where ambient temperatures exceed 45 °C. (2) Specify TTY head bolts with every gasket — reused bolts cause uneven clamping and are the #1 cause of repeat gasket failure. (3) Use OAT/HOAT coolant only — silicate-based coolants corrode the MLS coating and cause premature seal degradation. Kingmay includes a printed installation guide (English/Arabic) with every gasket order covering torque sequence, bolt replacement and coolant specification.
- Q6: What is the lead time for engine block and head orders?
- Stock items (G4NA, G4KD, Gamma blocks and heads): 2–3 days preparation + shipping transit. Non-stock engine codes: 10–15 days casting/machining lead time + shipping. Custom over-bore blocks: 15–20 days. Complete head assemblies with valves and cams: 5–7 days (valvetrain components assembled and lash-adjusted in-house). Rush orders (air freight) are available at 40–60% higher freight cost — contact us for DHL/FedEx air freight quotations.
- Q7: Do you provide warranty claims support in my country?
- Kingmay Auto Parts provides warranty claim handling via three channels: (1) photo/video documentation review within 48 hours; (2) replacement part shipment at our cost for verified manufacturing defects; (3) credit note against future orders for partial failures. We do not require return of defective parts for claims below US$500 — photographic evidence of the defect (crack, porosity, dimensional out-of-spec) is sufficient. For claims above US$500, we request return shipment at our expense for forensic analysis.
- Q8: Can you consolidate engine parts with a vehicle order from Globalucar?
- Yes. Globalucar Vehicle and Kingmay Auto Parts operate from the same Nansha Port logistics hub. Engine blocks, heads and gaskets can be consolidated into the same container as vehicle shipments, reducing per-unit freight cost by 30–45% compared to separate LCL shipments. This is particularly cost-effective for buyers ordering 2–4 vehicle units plus a pallet of maintenance parts. Contact ucars@global-ucars.com to coordinate consolidated shipment scheduling.
Ready to source Hyundai/Kia engine internal parts? Request a formal quotation with OE references and stock availability.
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Verify Part Numbers in Our OE Library
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