There's no reason to ever replace an engine from a plug blowing out unless you drove it for a very long time like that and washed a cylinder down from unburned fuel. At worst you're talking about replacing the heads but it's usually just a $300-$500 helicoil job.

 

I would tend to agree if I wasn't sitting on this end but sorry it does happen. Car died as soon as check engine light came on and was towed to repair shop. Wasn't driven at all. Had head removed and confirmed threads were gone. Had a Time-sert repair done and the engine was put back together. Once shop was able to get it running there was almost no compression in the #5 cylinder. They did a leak test on the head and the issue wasn't there. Based on the results, without tearing the engine all down again, the only explaination is something from the plug entered the cylinder and caused damage. Unfortunately I have only had the car for 4 months and it ran well for 6,000 miles until it died. Pehaps the plug had been loose for a while and the selling dealer missed it in their inspection prior to reselling. Based on what I have read on several forums both Honda and Acura, this has been somewhat of an issue with the V6 3.5L engine. Seems the #5 plug is the normal culprit. Not sure if it is vibration from the engine that causes the plug to loosen, improper torque when the vehicle was built or ?? Some people seem to have gotten lucky and had no serious damage, only having to reinstall the plug. Others have had the threads in the head strip/melt out and have been successful with a helicoil or Time-sert repair. In many cases, severe engine damage requiring replacement of short blocks, used engine swap outs, etc. Unfortunately mine seems to have fallen into the latter. Two days after mine went into the shop they got a Honda Pilot in with...yep... #5 plug blow out. They were going to do the same repair with the Time-sert but haven't heard whether they were one of the lucky ones or not.