Flexplate to crank hex size on bolts

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Dave W

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Cleveland
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David
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1978
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Custom Deluxe
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305
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

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

DoubleDingo

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

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