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Dizzy Clamp Bolt Size
https://slantsix.org/forum/viewtopic.php?t=59013
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Author:  63dartdude [ Sat Jan 23, 2016 9:55 am ]
Post subject:  Dizzy Clamp Bolt Size

What is the thread size of the dizzy clamp down bolt. I know it has a head that is 7/16", but I can't figure out what thread it has. Thanks.

Author:  63dartdude [ Sat Jan 23, 2016 10:33 am ]
Post subject: 

Never mind. I got it.

Author:  neilskiw [ Sat Jan 23, 2016 10:59 am ]
Post subject:  So What Size Is It ????

1/4-20 ??? 1/4-28 ??? Do tell... :shock:

Author:  63dartdude [ Sat Jan 23, 2016 12:04 pm ]
Post subject: 

I used a valve cover bolt. My problem was the bolt wasn't going in right. I pulled down the brace that has the hole in it for the bolt, to get it below it. I screwed in that bolt, and could see it fit. After moving it back up, I had to turn that brace a few times, so I could line up the bolt straight. I finally got it that way. So it is the same size as the valve cover bolts, whatever they are.

Author:  Old6rodder [ Sat Jan 23, 2016 1:21 pm ]
Post subject: 

Yup, 1/4-20.

Author:  Dart270 [ Sun Jan 24, 2016 4:36 am ]
Post subject: 

1/4-20 for earlier engines (pre 80s?) and 5/16-18 for later engines.

I don't know the cutoff year, but somewhere in the late 70s, I believe. I have a couple of cast crank blocks and they are 5/16-18.

Lou

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