The Bradford man, who surpassed 100 wins at the 2.43-mile circuit on Saturday, came out on top in the red-flag interrupted race to seal victory for Northern Ireland team Boyce Precision Engineering by Russell Racing.
After a delay, the feature race was held over eight laps with McLean again making a fast start on his R6, with Cork man Browne in second and Harrison third.
McLean was forced out on the second lap, while Harrison moved to the front ahead of Browne and quickly pulled a gap.
The home favourite was around six seconds clear when the race was stopped on the penultimate lap due to oil on the course, with Harrison declared the winner.
Browne finished as the runner-up with Cookstown rider Gary McCoy rounding out the top three on his Madbros Racing Suzuki.
Andy Smart, Joey Thompson and Marcus Simpson – a newcomer to England’s only road racing venue – were the top six.
On Saturday, Harrison won the first leg of the eight-lap Cock ’o the North showpiece by four seconds from McLean, with Rob Hodson rounding out the top three on the SMT Yamaha, 19 seconds down on the winner. Browne was fourth ahead of Thompson and McCoy.
The British Superbike rider triumphed in the opening Supersport race on Saturday by 11.5s from McLean with McCoy in third. It was Harrison’s 100th victory at Oliver’s Mount.
He won the second Supersport race on Sunday by an increased margin of 14 seconds from McLean, who was five seconds clear of Hodson in third. Browne again claimed fourth ahead of McCoy.
Harrison wrapped up a treble in the class with victory in race three by seven seconds from McCoy, who narrowly held off Browne for the runner-up spot by half-a-second.
The dominant 34-year-old also won all three Classic Superbike races in his first outing on the CK Racing Ducati 916SP.
Ulsterman McLean claimed the spoils in the first Supertwin race on the J McC Roofing Kawasaki on Saturday in a close finish by just 0.250s from Hodson, who prevailed in Sunday’s race by 10 seconds from runner-up McCoy.
The Cock ’o the North meeting returned to Oliver’s Mount this year for the first time since 2017.
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