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Old 02-05-2011, 09:09 PM   #1
swamp rat
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Crank Bolt size.

I need to know the "socket" size for a front crank bolt for a Big block and small block chevy, i beleve the small block is 9/16 by memory but could be wrong, Thanks!
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Old 02-05-2011, 10:33 PM   #2
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Re: Crank Bolt size.

SBC takes a 5/8" socket, BBC takes a 15/16" socket.
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Old 02-05-2011, 11:11 PM   #3
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Re: Crank Bolt size.

Quote:
Originally Posted by clinebarger View Post
SBC takes a 5/8" socket, BBC takes a 15/16" socket.
Thank you!
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Old 02-06-2011, 12:47 AM   #4
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Re: Crank Bolt size.

Ummmm I would say a BBC uses a 3/4" socket since it is a 1/2" bolt. Maybe 13/16" at the most......it's been a while since I've had a BB balancer bolt out.
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Old 02-06-2011, 04:03 AM   #5
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Re: Crank Bolt size.

Ok thanks, i just don't want to pack the whole set..
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Old 02-06-2011, 09:29 AM   #6
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Re: Crank Bolt size.

Also keep in mind after market, such as ARP or Moroso, are different sizes.
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Old 02-06-2011, 05:25 PM   #7
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Re: Crank Bolt size.

at least you weren't trying to figure out the shank size and thread pitch. its quite an odd ball with shank size and pitch
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Old 02-06-2011, 06:53 PM   #8
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Re: Crank Bolt size.

Quote:
Originally Posted by Captainfab View Post
Ummmm I would say a BBC uses a 3/4" socket since it is a 1/2" bolt. Maybe 13/16" at the most......it's been a while since I've had a BB balancer bolt out.
I just installed a 396/TH400 in a 65 Impala SS, The bolt had a 15/16" head & a 9/16" thread I guess it was drilled out?
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Old 02-07-2011, 12:34 AM   #9
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Re: Crank Bolt size.

That could be if someone stripped out the original threads. I just went out to my Suburban and checked.....3/4" socket fits.

Quote:
Originally Posted by clinebarger View Post
I just installed a 396/TH400 in a 65 Impala SS, The bolt had a 15/16" head & a 9/16" thread I guess it was drilled out?
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Old 02-07-2011, 12:36 AM   #10
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Re: Crank Bolt size.

Or different cranks, stock and aftermarket? Its no problem anymore guys, thanks for the help!
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Old 09-29-2018, 06:37 PM   #11
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Re: Crank Bolt size.

Hi All,
Do any of you know the thread size of the bolts that are used on the actual crank where it connects to the flexplate on a 402BBC?
Thanks in advance.
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Old 09-29-2018, 11:52 PM   #12
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Re: Crank Bolt size.

They are 7/16"-20. Just be sure you don't use bolts for a flywheel as they are too long and will ruin your block if you run it that way.
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Old 09-30-2018, 12:05 AM   #13
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Re: Crank Bolt size.

Flexplate bolts are shorter than the "flywheel" (manual trans) bolts, they both are the same size but the flexplate bolts are shorter, the longer bolts if used on a flexplate will come into contact of the block and rear main cap causing issues you do not want.
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