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Are the motor mount -> frame pad bolts 3/8" or 7/16?

73k5blazer

End the H1B Program!
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I'm bolting in my motor mounts to the truck, since I took it apart so long ago, I can't recollect if the bolts that hold the clamshell motor mount to the frame pad are supposed to be 3/8" or 7/16"?
The 7/16" fit, but the 3/8" would give it a little more play, since those holes are really somewhat slotted, for ease of dropping in the engine. I've got bins of various sizes of Grade 5 and grade 8 hardware, I just can't remember what those bolts are, I wanna say 3/8", and I'm sure they'd be enough to hold it down, but just trying to put it back together the way it came apart....
Anyone know off the top of their head?
 
Thanks.
I supposed I could have just looked in my GM parts book that lists it perfectly: Bolt - Hex (3/8-16 x1")
Duh!
 

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