Sorry to hear another one bites the dust. Low Kms and stock standard will help a challenge but some common areas that will come up should you seek Consumer Guarantee under Australian Consumer Law within NCAT include: what is the vehicle's service history - did you continue to drive it after hearing the noises and what noises preceded this engine's final 'death' stage - were these/similar abnormal engine noises ever identified or recorded by an authorised GMANZ approved dealer inside or outside warranty ... a GM initiated inspection or engine disassembly without your consent or attendance is highly risky. Also beware of misrepresentations of Laws (I was crudely 'advised' in QCAT a Major Fault under ACL applies in brief should you are unable to drive on a selected day between point A and B due to an engine fault) -that QLD Tribunal's narrow interpretation of ACL is currently being raised to the QAG and challenged more widely - real ACL does offer far more so suggest read the Act asap). My experience was if repair will cost GMANZ a large amount of money it fights dirty to stop risking a ruled ACL precedence (which could be your LS3 matter).