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Old 08-16-2020, 06:09 PM   #1
DBSHELTON
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Default V8 Clutch Bolt Pattern

Anyone know what the Pressure plate bolt pattern is for a V8 Clutch? I have one on order but I thought I would go ahead and cut and drill and tap the holes in my flywheel in the mean time.
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Old 08-16-2020, 06:16 PM   #2
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Default Re: V8 Clutch Bolt Pattern

What size clutch? I have a 11" here sitting on the bench, is this a dump truck you are working with?
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Old 08-16-2020, 06:48 PM   #3
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Default Re: V8 Clutch Bolt Pattern

Sorry, looking at a 9" clutch.


Small world. My cousin used to be school superintendent in West.
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Old 08-16-2020, 06:57 PM   #4
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Default Re: V8 Clutch Bolt Pattern

Quote:
Originally Posted by DBSHELTON View Post
Sorry, looking at a 9" clutch.


Small world. My cousin used to be school superintendent in West.
https://www.fordbarn.com/forum/showt...=230632&page=6
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Old 08-17-2020, 04:58 AM   #5
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Default Re: V8 Clutch Bolt Pattern

Thanks for the info
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Old 08-17-2020, 07:50 AM   #6
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Default Re: V8 Clutch Bolt Pattern

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I would wait until I had the Pressure Plate in hand and measure off the new plate.
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Old 08-17-2020, 08:35 AM   #7
BRENT in 10-uh-C
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Default Re: V8 Clutch Bolt Pattern

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Originally Posted by DBSHELTON View Post
Anyone know what the Pressure plate bolt pattern is for a V8 Clutch? I have one on order but I thought I would go ahead and cut and drill and tap the holes in my flywheel in the mean time.
Just curious, are you going to use a rotary table on a mill for layout, -or are you going to use coordinates and a DRO??
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Old 08-17-2020, 12:55 PM   #8
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Default Re: V8 Clutch Bolt Pattern

This is an old thread for the Ford/Long 10-inch flywheel drilling dimensions so a person can get an idea of how to go about it.
https://www.fordbarn.com/forum/showt...4069&showall=1

The 9-inch clutch is on a 10.375" circle so that can be divided by 2 to get the radius for the centerline to hole distance. It will be 120 degrees between the first holes and should be 32 degrees between pairs. The distance between pair centers is approximately 2.830" if I remember correctly. A person can use a DRO if they have one or a rotary index table. It just depends on what a person has available to them. It should also be noted about where the original set of holes is so that they can be spaced evenly apart enough to prevent weakening the flywheel. Hole sizes and thread per inch should reflect the size of the cover bolts that will be used.

Last edited by rotorwrench; 08-17-2020 at 01:01 PM.
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Old 08-17-2020, 01:57 PM   #9
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Default Re: V8 Clutch Bolt Pattern

After measuring, it won't quite fit in my lathe.
I took it to a general machine shop we use at work he will do it for me but will wait until the pressure plate is in hand later this week to drill and tap the holes.
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Old 08-17-2020, 02:36 PM   #10
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Default Re: V8 Clutch Bolt Pattern

You can cut the circumference of the flywheel down to 11.125 safely..leaving enough to support the ring gear..balance the assembly complete with disc,pp and flywheel..good luck
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Old 08-17-2020, 02:51 PM   #11
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Default Re: V8 Clutch Bolt Pattern

11.125? Not sure but I think the ring gear is larger than that.
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Old 08-17-2020, 03:54 PM   #12
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Default Re: V8 Clutch Bolt Pattern

Try this
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File Type: jpg FlywheelLightV8PressurePlate.jpg (46.1 KB, 83 views)
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Old 08-17-2020, 03:57 PM   #13
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Default Re: V8 Clutch Bolt Pattern

The bolt pattern diameter is 10.375. The holes are 120 degrees apart with a separation of 32 degrees between the two diameters.
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Old 08-20-2020, 12:54 PM   #14
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Default Re: V8 Clutch Bolt Pattern

Should I have the flywheel and clutch balanced? The rest of the engine hasn't been balanced.
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Old 08-20-2020, 01:15 PM   #15
BRENT in 10-uh-C
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Default Re: V8 Clutch Bolt Pattern

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Should I have the flywheel and clutch balanced? The rest of the engine hasn't been balanced.
I can tell you from experience that you will regret not balancing the flywheel first, and then the pressure plate to the flywheel.
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Old 08-20-2020, 01:16 PM   #16
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Default Re: V8 Clutch Bolt Pattern

That is the way I was leaning.
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Old 09-02-2020, 07:00 PM   #17
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Default Re: V8 Clutch Bolt Pattern

Got my flywheel back today. Weighed in at 39.5 pounds. Will get it all balanced next week.
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