OP, you beat me to the punch on posting a thread like this. I ordered a short block from JDM on June 20. I was told 2-3 weeks delivery which was why I chose to order from them. Livernois delivery was 4-6 weeks and with the short summers we have in Canada I wanted my car up & running as soon as possible. My mistake.
After several emails and phone calls with broken promises on delivery I threatened to cancel the order and my shortblock was finally shipped on September 23.
On October 8 the shortblock was in the car & running and as my luck would have it, on October 13 the motor blew while on the dyno. At this point I was so pissed with my car as this was the second built motor that went on me this year that I have only pulled the motor out of the car and have not torn it apart to assess the damage or try to find the cause. I am not blaming JDM for the failure at this time as I do not know what went wrong. That will be in a thread on a future date once I get thing taken apart.
I surely hope the OP has better luck with his motor. JimIII, I have read all the excuses but they are just that & don't hold a lot of water. Extremely poor customer service will not keep customers loyal, honesty will.