The 17-year-old Otago Boys' High School pupil was named in the under-18 New Zealand men's team yesterday.
The side will contest the Fiba Oceania Championships in Guam on July 9-15.
For Porima-Flavell, it will be his first experience at an international tournament and he is looking forward to it.
The 2.01m swingman grew up in Sydney but moved to New Zealand with his family when he was 10.
He started playing basketball at Tahuna Normal Intermediate and soon after began making Otago age-group representative teams.
When he arrived at Otago Boys', towering centre Timmins was an inspiration.
Timmins led the school to glory at the national secondary schools tournament in 2014 and he joined the Washington Huskies in December 2015.
Porima-Flavell would like to follow Timmins and play college basketball in the United States.
''Definitely. I'd love to,'' he said.
''Obviously coming here in year 9 and having Sam and Joe [Cook-Green] at the school and them going away to college in the States was good to look up to.''
In the meantime, he is working on his jump shot.
''Right now I just want to get better each day.
''I like to go to the hoop and I'm trying to develop more of an outside game and trying to get a jumper. It is a work in progress,'' he said.
Porima-Flavell is related to former All Black Troy Flavell and Maori Party co-leader Te Ururoa Flavell.
Former Otago Nuggets centre Miles Pearce is coaching the side.
New Zealand is drawn in group A along with Tahiti, the Marshall Islands and Guam.
Australia is on the other side of the draw with New Caledonia, Samoa and Palau.
Traditionally, the tournament has come down to battle between Australia and New Zealand.
New Zealand will need a top-two finish to qualify for the Asia age-group championships.
If the team can finish in the top four at the Asian championships, then it will qualify for the world cup.
''We are really happy with the group we have assembled,'' Pearce said.
''They are a credit to the associations that work with these boys week in and week out.
''The boys are coming in with a full skill set that we feel can produce at international level.''
Otago's Olivia O'Neill has been named in the New Zealand under-18 women's team which will also compete at the tournament.
