Yep - 5/16"
This is what one of the gurus on Classicmako.com had posted some time ago:
There should be 3 bolt holes that you can use right in the flywheel. They are 5/16-24 (5/16" dia and 24 threads per inch, otherwise known as UNF). You can use a flywheel puller as a lift eye or fabricate a plate with a loop to lift it.
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1973 Mako 20' Center Console
1984 Wellcraft V20 Cuddy
1977 Wellcraft V20 Center Console
1975 Wellcraft V17 Center Console
1964 16' Super Skeeter with 55Lb thrust Motorguide Trolling Motor
1985 Glastron HPV-175 - sold
1984 Wellcraft 180 Fisherman - sold
1973 Mako 17' Angler - sold
1972 Mako 17' Standard - sold
1972 Mako 19' Center Console - sold
Always looking for the next one.
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