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Joined: Dec 2010
Home Port: Kings Park, NY
Vessel Info: 2003 38' Open Cummin's 6CTA's (450 hp)
Posts: 695
Threads: 13
Likes Given: 1
Likes Received: 92 in 84 posts
Joined: Dec 2010
Home Port: Kings Park, NY
Vessel Info: 2003 38' Open Cummin's 6CTA's (450 hp)
Not sure what size the 42 Open w/QSM 660's use but my 2003 38 Open w/450 Cummins uses 2" zinc's. I'm sure someone on the site w/42 Open will let you know. If not contact Tiara Customer service and provide the HIN number. I'm sure they can help.
Best to measure the shaft diameter. If you don't have a caliper measure the shaft circumference with a flexible tape ruler and divide by 3.14 to get diameter. Its likely between 2 1/4 - 2 3/4 diameter.