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Flexplate Bolt Sizes

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Old 04-29-2012, 06:49 PM   #1
cosworth
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Flexplate Bolt Sizes

I have a 74 Duster with a 318 that was originally a automatic car, that i am putting a 3 speed manual in. I purchased pressure plate bolts that are wayyyy to small, then thinking about it I dug out my old flexplate bolts that are the right size but too short.....

Does anyone know what size this is and where i can find them?

May just need to run down to the hardware store these bolts are only grade 8
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Old 04-29-2012, 08:13 PM   #2
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I think ive figured it out posting here for somebody to correct me if im wrong.

7/16-20RH with approx .910 Underhead bolt lenght.

Flexplate bolts are 7/16-20 with .50 underhead
Pressureplate are 3/8 with approx .910 underhead
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Old 04-29-2012, 09:59 PM   #3
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..........sounds about right...............kim............
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Old 04-29-2012, 10:42 PM   #4
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I guess they used different cranks for auto/manual cars?
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