Isuzu 4JG2-B Cylinder head assembly Inlet valve 42.10mm 171010
171010The Isuzu 4JG2-B Cylinder Head Assembly (42.10 mm inlet valves) 171010 suits engines that begin to lose compression, burn coolant, or show cracks around the intake side. The casting sits neatly on the block, and the port shape matches the 4JG2-B layout, so mechanics can fit it without extra adjustments. It works well for top-end rebuilds where the old head is worn or beyond repair and helps the engine return to steady running.
The Isuzu 4JG2-B Cylinder Head Assembly 171010 fits engines commonly used in older 4x4s, vans, and work vehicles. These engines run hard, and after years of heat cycles the original head often warps or cracks near the inlet valves. When that happens, a clean replacement head makes the repair far more dependable than welding or resurfacing the old one. This assembly sits flat once placed on the block, and the coolant and oil passages follow the factory layout, making installation straightforward even in tight bays.
The 42.10 mm inlet valves give the head the correct airflow pattern for the 4JG2-B, so the engine breathes the way it should once everything is timed and torqued. Another thing worth noting is how the combustion chambers match the original shape, which helps the engine settle into a smoother idle after the rebuild. The deck surface comes clean and even, so you don’t waste time correcting high spots before fitting the gasket.
Why many workshops choose this assembly:
- Fits Isuzu 4JG2-B engines with the correct 42.10 mm inlet valve setup
- Helps fix compression loss, overheating cracks, and worn intake seats
- Sits flat on the block for consistent sealing
- Works with standard injectors, timing parts, and gasket sets
- Reduces prep time during top-end repairs
In most cases, mechanics use this head when they want a straightforward, direct-fit replacement that holds up during daily driving or heavy use. Once installed and timed, the engine usually runs cleaner and steadier than it did with the worn head.
Acme Impex checks each casting and machining point before dispatch, so the head arrives clean, aligned, and ready for installation. If you need a replacement head for a 4JG2-B engine and want a smooth rebuild process, this assembly is a practical choice for both workshops and vehicle owners.