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I just finished rebuilding a zd30, what a job, rebuild cost me about $3500 with new injectors, waterpump, timing chain, belts, hoses etc... long process doing it in spare time though.
if I had the time I'd really like to do the same, but ive got too much on at the moment. if the engine is not too bad I'll probably get an engine rebuilder to rebuild it. did you do all the NADS stuff? if so, was it difficult?