If you work on modern Hyundai performance platforms, you’ve probably heard the buzz around the
Cylinder head assembly G4KH used for Hyundai Elantra N i30 N Kona N Santa Fe Sonata Auto Parts 2.0L 192kW 365Nm.
Built for daily drivability and weekend track fun, it’s one of those parts that quietly decides whether your build feels tight or tired.
Why the G4KH head matters right now
The 2.0L turbo G4KH family (192 kW, 365 Nm) underpins Hyundai’s N cars and some well-loved commuters. Trend-wise, shops report rising demand for OE-grade heads with strict leak and flatness tolerances—because higher boost, ethanol blends, and stop-start heat cycles are unforgiving. Honestly, the number of “resurface and pray” jobs is dropping; full assemblies are the smarter play.
Quick specs
| Engine code / models | G4KH 2.0T — Elantra N, i30 N, Kona N, Santa Fe, Sonata |
| Material | Al-Si alloy A356-T6 (≈), sintered steel valve seats, manganese-bronze guides |
| Valvetrain | DOHC, 16-valve, VVT compatible, pent-roof chambers |
| Surface flatness | ≤ 0.03 mm (new), Ra ≤ 0.8 μm (≈ real-world) |
| Pressure test | 0.6–0.8 MPa @ 80–95°C, no visible seepage |
| Weight | ≈ 12.5 kg with seats/guides installed |
| Origin | 289 Heping East Road, Chang’an District, Shijiazhuang, Hebei, China |
Manufacturing flow and testing
Materials are certified A356 ingots, then precision die-cast (or gravity-cast for some batches), T6 heat-treated, and 5-axis CNC machined. Valve seats are interference-fitted; guides are honed to spec. Every head is hot leak-tested, dye-penetrant inspected (ASTM E165/E165M), and checked for surface roughness per ISO 4287. Batch PPAP and traceability? Yes—aligned to IATF 16949 practices.
Where it fits and why shops like it
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– Direct applications: Elantra N / i30 N / Kona N / Santa Fe / Sonata with G4KH 2.0T (verify by VIN).
– Scenarios: boosted street builds, track-day refresh, warranty replacement after overheating, high-mileage fleet repairs.
– Advantages: consistent sealing under boost, clean coolant galleries, predictable cam bore geometry—less line-boring drama.
A tech in Texas told me, “We swapped to the Cylinder head assembly G4KH used for Hyundai Elantra N i30 N Kona N Santa Fe Sonata Auto Parts 2.0L 192kW 365Nm and knock correction calmed down immediately.” Not scientific, but it tracks with our own dyno notes.
Vendor comparison (field notes)
| Vendor | Lead time | QC docs | Warranty | Customization |
|---|---|---|---|---|
| Oujia Engine (this unit) | ≈ 7–15 days ex-works | IATF/PPAP lot trace, pressure-test sheet | 12 months (usage-dependent) | Valve-seat spec, guide material, surfacing |
| OEM dealer | Stock-dependent | OEM spec sheet | 12–24 months | Limited |
| Generic aftermarket | Varies | Minimal | 3–6 months | Rare |
Customization and service life
Options include upgraded seat alloys, bronze guide choices, and final surfacing for MLS gaskets. In real-world use, service life can exceed 200,000 km with proper cooling and oiling. For fleets, consider periodic coolant chemistry checks—cheap insurance.
Case snapshot
A Sydney tuner replaced a cracked core on an i30 N running moderate boost. With the Cylinder head assembly G4KH used for Hyundai Elantra N i30 N Kona N Santa Fe Sonata Auto Parts 2.0L 192kW 365Nm, leakdown stabilized at 2–3% across cylinders and coolant loss vanished over 1,500 km. Not flashy, just solid fundamentals.
Certifications, standards, and test data
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– Quality system: IATF 16949-aligned, ISO 9001 documented.
– Inspections: dye-penetrant (ASTM E165/E165M), surface roughness (ISO 4287).
– Casting notes: A356 per ASTM B26/B26M; tolerances guided by ISO 8062-3.
– Sample test data (typical): 0/30 heads failed hot pressure at 0.7 MPa; cam bore roundness ≤ 0.01 mm; deck flatness median 0.018 mm.
Final word? It’s a pragmatic, race-weekend-friendly solution. Not the cheapest, but the downtime you save—many customers say that’s the real bargain.
Authoritative citations
Oujia has been providing the professional engine parts for 17 years.connecting rod As a reliable supplier and partner, Oujia focuses on various engine parts, especially on gasoline engine parts and on diesel parts for passenger cars.exhaust valve Oujia not only provides high and stable quality and excellent services to our customers, but also provides long-term self- brand creation and OEM services for our overseas customers.engine assembly Our company products mainly include: engine, cylinder head, cylinder block, crankshaft, piston, piston ring, intake valve, exhaust valve, timing kit, gasket set, connecting rod, crankshaft bearings, connecting rod bearings, intake camshafts, exhaust camshafts, water pumps, oil pumps Etc.piston kit focus on the aftermarket, our products are guaranteed for 100,000 kilometers.Our products are exported to Germany, Russia, Brazil, Japan, the United States, and the Middle East. We are a trading company. We choose the most stable quality factories in China to cooperate with. We cooperate with 7,600 factories in China and sell 74,000 products each year. , we have 26,000 models in stock.gasket set manufacturer|super blog