The second GNCC event he will contest is round 11 in St Clairsville, Ohio, on October 7.
There will be several Kiwis in that race with just-crowned New Zealand cross-country and enduro double champion Adrian Smith (Yamaha), of Mokau, arriving just the week before this event.
Wellington's Rory Mead, who won the New Zealand Enduro Championships for Yamaha last season before heading to the US, will also line up at the final few rounds of the GNCC series.
In between these GNCC races, Sowry will be racing a couple of local cross-country events such as a round of the Mid-East XC Championships.
The teenager, a year 12 student at Tararua College, has already tasted international success on the motorcycle cross-country scene, having won the under-200cc class at the Australian Off-Road Championships last year and also winning the junior under-200cc title at the New Zealand Cross-country Championships earlier this year.
"But now he's heading off to play with the really big boys," said Stu Sowry.
"Paul [Whibley] suggested he come over and join him, to get a taste of the sport in the US. He may return and do a few more races next season, with a view to perhaps mounting a full season campaign in 2014.
"Obviously Scott wants to do well but he's not expecting too much. He just wants to turn a few heads and hopefully get a ride sorted for 2014."
Sowry returns to New Zealand on October 9.
Meanwhile, his mentor Whibley rides a more powerful Yamaha YZ450F and leads the top class in the GNCC series, the XC1 Pro grade.