Thread size please?

[ONEGA]

Please can anyone tell me off hand what the thread size is for flywheel studs on the crank flange for 350?
Two holes stayed open for a few months and one stud won't go all the way in now so I need to chase the thread. Thought it's 7/16 but it's not.
Thanks.

 

[Bt Doctur]

3/8 x 24 or 7/16 x 20

 

[Fun Times]

What year engine are you working? You have two in your signature line.

Item number 16, SCREW, (.437-20 x 1.00), FLYWHEEL TO CRANKSHAFT

http://www.mercruiserparts.com/Show...br=1077&bnbr=190&bdesc=CRANKSHAFT+AND+PISTONS

 

[ONEGA]

Working on my friend's motor, '87 vintage. Flywheel and rear motor mounts replacement.
7/16 x 20 that's what I thought and that's what it is. Have no idea why it didn't look right to me last morning.
Thanks folks.