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.
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.
| 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 |
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.
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 | 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 |
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.
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.
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.
