Flexplate to crank hex size on bolts

[Dave W]

Anyone know the hex size on the flexplate bolts that bolt up to the crank?
I want to check that there tight, while on the vehicle.
Will have to modify s wrench to get up in there. 1978 Chevy 5.0 305 with t350
Thanks

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[78C10BigTen]

If i was with my truck atm i could tell you because i have many extra... but im currently out.

 

[DoubleDingo]

11/16 or 3/4 if my memory hasn't failed

 

[PrairieDrifter]

11/16