The Ford Barn

50Trucking · 05-16-2025, 08:58 AM

Does anyone have a PDF that I can give to my machine shop for them to properly locate the V8 clutch holes to drill them on the lightened flywheel?
Lighten flywheel drawings would also be good to have.

katy · 05-16-2025, 09:30 AM

Can't they use the V8 clutch?

Dan McEachern · 05-16-2025, 12:16 PM

Always good to double check............see attachment.

nkaminar · 05-16-2025, 12:27 PM

Not sure what the bolt size is but don't drill the 0.312 hole in the flywheel but thread it.

Dan McEachern · 05-16-2025, 09:03 PM

Bolts are 5/16-18. Drill and tap accordingly. The 1st 1/4-5/16" of the hole is 5/16 dia for the shank of the PP bolt to enter. PP Bolts ere not threaded all the way under the head, just FYI.

nkaminar · 05-17-2025, 06:18 AM

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That shank is what locates the pressure plate.

rotorwrench · 05-17-2025, 07:46 AM

Long type clutches use the 3 pairs of bolts with the pairs being closely spaced. Most machine shops can use a machining index to mount the flywheel and rotate it in the mill with distance from center adjusted and degree setting of each bolt hole. All 9-inch inch Long clutches use the same distance and spacing so it's not a difficult job. Just bring them the flywheel and clutch cover for set up. Different diameter Long clutches have different distance and spacing to suit the diameter of the clutch.

Modern diaphragm and older Borg & Beck clutches all use 6 evenly spaced bolt holes and may have 3/8" bolts depending on the auto manufacturer's specifications.

Bob C · 05-17-2025, 10:56 AM

Here's a picture of the bolt with the shoulder.

johnneilson · 05-17-2025, 03:54 PM

Quote:

Originally Posted by rotorwrench

Long type clutches use the 3 pairs of bolts with the pairs being closely spaced. Most machine shops can use a machining index to mount the flywheel and rotate it in the mill with distance from center adjusted and degree setting of each bolt hole. All 9-inch inch Long clutches use the same distance and spacing so it's not a difficult job. Just bring them the flywheel and clutch cover for set up. Different diameter Long clutches have different distance and spacing to suit the diameter of the clutch.

Modern diaphragm and older Borg & Beck clutches all use 6 evenly spaced bolt holes and may have 3/8" bolts depending on the auto manufacturer's specifications.

Some of the ford diaphragm clutches use the 3 pair very close to the 9in long clutch
I have seen some folks just file the holes out and bolt it on

J

05-16-2025, 08:58 AM	#1
50Trucking Member Join Date: Sep 2020 Location: St Augustine Fl Posts: 56	V8 Clutch conversion drawings Does anyone have a PDF that I can give to my machine shop for them to properly locate the V8 clutch holes to drill them on the lightened flywheel? Lighten flywheel drawings would also be good to have.

05-16-2025, 09:30 AM	#2
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,715	Re: V8 Clutch conversion drawings Can't they use the V8 clutch? __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

05-16-2025, 12:27 PM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,860	Re: V8 Clutch conversion drawings Not sure what the bolt size is but don't drill the 0.312 hole in the flywheel but thread it. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

05-16-2025, 09:03 PM	#5
Dan McEachern Senior Member Join Date: Aug 2010 Location: SF Bay Area Posts: 254	Re: V8 Clutch conversion drawings Bolts are 5/16-18. Drill and tap accordingly. The 1st 1/4-5/16" of the hole is 5/16 dia for the shank of the PP bolt to enter. PP Bolts ere not threaded all the way under the head, just FYI. Last edited by Dan McEachern; 05-17-2025 at 11:37 AM.

05-17-2025, 06:18 AM	#6
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,860	Re: V8 Clutch conversion drawings Sponsored Links (Register now to hide all advertisements) That shank is what locates the pressure plate. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

05-17-2025, 07:46 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 17,410	Re: V8 Clutch conversion drawings Long type clutches use the 3 pairs of bolts with the pairs being closely spaced. Most machine shops can use a machining index to mount the flywheel and rotate it in the mill with distance from center adjusted and degree setting of each bolt hole. All 9-inch inch Long clutches use the same distance and spacing so it's not a difficult job. Just bring them the flywheel and clutch cover for set up. Different diameter Long clutches have different distance and spacing to suit the diameter of the clutch. Modern diaphragm and older Borg & Beck clutches all use 6 evenly spaced bolt holes and may have 3/8" bolts depending on the auto manufacturer's specifications.