John McGuinness and Dave Molyneux lie second and third behind Joey Dunlop in the success ratings.
Lincolnshire's Guy Martin was fourth while pre-race favourite John McGuinness was back in fifth place.
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The flying Kiwi secured his sixth overall win on the island 40 seconds ahead of runner-up John McGuinness.
BBC: Anstey pushes his bike to the limit around the TT course
John McGuinness is expected to compete in the meeting, a year after his lap record heroics at Dundrod.
Ryan Farquhar and John McGuinness retired during the race because of mechanical failure.
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Isle of Man TT star John McGuinness said he feels "emotional" about having a corner section of the 38-mile Mountain circuit named after him.
Top North West competitors John McGuinness and Keith Amor are scheduled to compete for Honda Europe that day at the World Endurance event in Albacete.
Last year's treble hero and 11-times winner John McGuinness rides again for HM Plant Honda and Padgett's Honda and Ian Hutchinson is also Honda mounted.
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That's not quite right according to political analyst John McGuinness.
His main challengers will include road race specialists John McGuinness and Ian Hutchinson, Dennis Hobbs, Steve Brogan and Hudson Kennaugh, with Castlerock's Marty Nutt and Omagh's BJ Toal also in the field.
Mr. JOHN McGUINNESS (Political Analyst): He didn't really pick the senate president and speaker of the house but he more or less blessed the ones who emerge as the leaders, who are accessible to him.
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