I don't think the term USDM exist truely, I was simply using it to state production area of origin.

You will find that there are both 100% Japanesse made and 100% American made Accord Products--and some down the middle. End of story.

Basically if you go to temple of vtec you can easily see the production numbers per month. It even brakes up imported and domestically sourced of the same model.

However, I am under the impression honda doesn't have to many plants outside the US producing the J-series engine. I currently think Ohio and Alabama are the two states producing this engine. Anyone a Honda plant junky to confirm?