Answer
Dec 06, 2021 - 05:11 PM
This 2004-2006 Isuzu NHR NKR NPR NQR NPS Series Service Manual does cover the 4HK1 engine and mentions doing so for the following regions: Europe/EXP/Australia/Hong Kong.
Since I cannot find any indication that the 4HK1 5.2L engine was modified in any way for any of the markets, I can only assume that it's the same for all, and as such, should work for the American variant too. Unfortunately, that's as far as I can tell (and I looked quite thoroughly, to be honest lol). It seems like the exact same thing but there might be slight differences here and there — hard to tell without the engine beside me to confirm.
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