1KD rebuild.

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Hi my 120 has done 320000km now and I'd like to get that again and want to give the engine bit of a freshen up. As a mechanic I've rebuilt plenty of engines but was interested to know if anyone has any experience regarding rebuilding these engines. Just wondering how the bores hold up at this sort of kms. I basically plan to just do pistons rings and bearings and a valve job. I'll measure everything else up and reuse if in spec I'd just like to know if anyone knows of any weaknesses that should be addressed while in there or any info that would be helpful.