Quote:
Originally Posted by Speedbumpauto
Any of the ones I've done, mostly V-8's use a 5/16 NF(24) on that water pump flange. That and the crank pulley to balancer are the few fine thread bolts on that vehicle.
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Yes, I've never seen a small block pump with anything else.
I've never seen one with 1/4 inch bolt holes either.
In case you can't eyeball a bolt and tell it's diameter, outside of a few odd ball bolts the following almost always holds true.
1/4 inch bolt = 7/16 wrench
5/16 inch bolt = 1/2 wrench
3/8 inch bolt = 9/16 wrench
7/16 inch bolt = 5/8 wrench but often has a nut that takes a 11/16 nut.
1/2 inch bolt = 3/4 wrench
The larger sizes can be mix and match so I left them out.