NQR 1994-2018 - OEM 8-97358-366-0 8973583660 Cylinder Head for Isuzu N-Serie NPR 300 400 NQR 500 4HE1 Engine – OEM 8-97358-366-0

Product Overview: Designed as a complete replacement cylinder head for 4HE1 engines, this assembly arrives ready for fitment with valve seats and guides already installed. It serves Isuzu platforms and reproduces the original chamber volume, port shape and camshaft bearing alignment. Every head is inspected and pressure tested before shipment and is supplied new with a 12-month warranty. It is intended for replace/repair use and is a cost-effective alternative to reconditioning a damaged original head. The unit is inspected for flatness and gallery cleanliness prior to dispatch, ensuring it is ready for immediate fitment.

Key Features: Manufactured in high-grade aluminium alloy or cast iron, this cylinder head is machined on CNC centres to original tolerances for deck flatness, valve seat alignment and port volume. Seats and guides are fitted and honed, and chamber volumes are equalised across cylinders for even compression and smooth running. Thickened sections around the valve bridge and combustion bowl resist thermal cycling, and the precision-machined cam carrier keeps bearing clearances within specification. All internal oil and coolant galleries are cleaned, inspected and flow-checked before the head is assembled and tested. The casting is dimensionally stable and accepts original-specification gaskets, bolts and ancillary components.

Vehicle Compatibility: Compatible applications include NQR 1994-2018; NQR 1994-2016; NPR-HD 1993-2017; NPR-HD 1998-2018. Verify the engine code and OE number cast or stamped on the original head before purchase, since a single model line can use more than one casting revision. Coverage spans the 1998-2004, 1986-2018, 1986-2017, 1993-2017 model years.

Specifications: Engine code / family: 4HE1; Material: high-grade aluminium alloy or cast iron; Size: STD; Condition: New, supplied for replace/repair use; Warranty: 12 Months; Packaging: neutral export carton.

OEM / Reference Numbers: Applicable OEM and reference numbers are 8-97358-366-0, 8973583660. Compare the stamped or cast numbers on the removed component with this list, as several revisions may exist within a model range.

Applications: Typical applications include Isuzu passenger cars, vans and light commercial vehicles, covering routine workshop repair, preventive maintenance and full engine rebuilds.

Benefits / Replacement Information: Replacing a damaged original with this ready-built assembly restores compression and combustion sealing while avoiding the labour and lead time of separate valve and seat work. Coolant leaks, cross-cylinder gas transfer and compression imbalance caused by cracks or warping are resolved in one operation.

Installation or Fitment Notes: Installation requires a clean, flat block surface and correctly cleaned bolt holes. Use a new gasket of the correct type and thickness, fit new fasteners where torque-to-yield bolts are specified, and tighten in the prescribed sequence. Refill and bleed the cooling system with the recommended coolant, then re-check levels after the first heat cycle.