Kamo had a tough start to the chase as Caleb Boswell-Smith (4 for 36) made early breakthroughs.
At 40 for 4, Kamo captain Ben Hyde was joined by Curtis Cherrington (32) and they went about rebuilding the innings.
Hyde reached a well-compiled 50, which included five boundaries and a six, before both he and Cherrington went within eight deliveries of each other off the bowling of Cullen Lowe (3 for 28).
The loss of the set batsmen sparked a collapse which saw Kamo lose five wickets for 13 runs to be on the ropes at 132 for 9.
However a determined last-wicket stand between Shane Burton (10 not out) and Parkes (3 not out) got them over the line, sparking major celebrations.
After the first day of the penultimate round of Oxford Trust Two Day cricket was abandoned last week, outright results were going to be tough to achieve.
However Duracrete Products City and WBHS made sure a result was found in their match.
Black Cap Corey Anderson was down at Kensington Park running the WBHS side through their paces pre-match, before the start was delayed due to wet conditions.
Both sides declared their first innings to force a result as City batted first, scoring 168 for 6 on the back of 50-plus scores from Stacy Hyndman (55) and Bert Horner (50).
Lewis Miller (4 for 51) was the pick of the WBHS bowlers.
Luke Trigg's 42 was the backbone of the innings, however sublime spells from Robbie McPherson (4 for 18) and Hyndman (4 for 35) restricted WBHS to 156 all out.
Meanwhile competition leaders Kaipara Flats moved one step closer to claiming the title.
They picked up first-innings points against Kamo after rolling them for 86. Kaipara Flats earned the points the hard way as they were bowled out for 127 in a low-scoring affair.
Onerahi, meanwhile, picked up first-innings points against Westech Automotives Maungakaramea after a five-wicket haul from Fletcher Coutts helped them roll their opposition for just 48.
Meanwhile in reserve grade T20 action Kamo High, Kerikeri and City all had convincing wins.
Kamo High easily accounted for Onerahi Central with a seven-wicket win.
BJ Howie's 29 was the only innings of note as Onerahi crumbled to 77 all out as Geoff Parker (3 for 9) proved difficult to play.
Kamo High had a bumpy start to their chase but Max Turner (23 not out) and Nathan Parkes (21 not out) saw them home.
Kerikeri rolled the WBHS 2nd XI for 47 in their match.
Max Hart's leg-spin yielded figures of 4-2-8-3 in a stunning spell before they cantered home just two wickets down.
In the other match, City eased to a 10-wicket win over Maungakaramea.
Darren Goodwin's 3 for 11 helped restrict Maungakaramea to 108 for 9 before Joey Yovich hit an unbeaten 85 from just 54 balls to take the spoils.