What size clutch in a 65 Barracuda Formula S ??

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Blue62Val

Blue62Val

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Hi all,

"yes"....I have tried searching, but still unsure.

I'm about to purchase a new clutch kit for the Formula S I recently bought.
Rock Auto lists a few kits that are all around the 10 1/2" type, but....... my manual says that the Vals and Barrcudas had 9 1/2".
I also see comments about needing a larger bellhousing for a 10.5 unit.

Just wondering if anyone can give me a simple answer, and whether it's better with the Borg and Beck PP, or really doesn't matter that much ? I'm restoring the car and don't intend racing.....just want it to run right.

Thanks,

Peter
 
9.5 was the stock size. IIRC Brewers offers(ed) a scalloped 10 in clutch set that fit the stock flywheel and bellhousing.
 
65 Dartman said:
9.5 was the stock size. IIRC Brewers offers(ed) a scalloped 10 in clutch set that fit the stock flywheel and bellhousing.
Click to expand...

Thanks mate.....makes me wonder why Rock Auto lists the larger clutch kits, then ?
 
This is what the Auburn style 9.5” clutch looks like.

I have done the swap on my 1967 Barracuda, you can replace the Auburn pressure plate with the 10” Borg & Beck pressure plate and 10” clutch disk.

The 10” B&B pressure plate uses the same flywheel, bellhousing, z-bar and clutch fork. The only thing you will need is three extra shouldered bolts to hold the pressure plate to the flywheel. Brewer’s has them!

IMG_6752.jpeg
 
mopardude62 said:
This is what the Auburn style 9.5” clutch looks like.

I have done the swap on my 1967 Barracuda, you can replace the Auburn pressure plate with the 10” Borg & Beck pressure plate and 10” clutch disk.

The 10” B&B pressure plate uses the same flywheel, bellhousing, z-bar and clutch fork. The only thing you will need is three extra shouldered bolts to hold the pressure plate to the flywheel. Brewer’s has them!

View attachment 1716350059
Click to expand...
I have allways thought that was the goofiest looking pressure plate ever. I have the 10" scalloped kit in mine. Works great.
 
Did you need to change the flywheel of bell housing to accomodate the 10" plate ?
 
Blue62Val said:
Did you need to change the flywheel of bell housing to accomodate the 10" plate ?
Click to expand...
No. You just need the right 10" clutch. It has a pressure plate that's scalloped around the bolt holes so that the larger disc fits on the same flywheel. I have two. One on my car now and another hybrid kit with the scalloped 10" Mopar pressure plate, but with a Ford 10" disc for use with the Ford T5 transmission I'm going to swap in the car down the road.
 
Whatever clutch kit you get, make sure the throw out bearing collar is metal, not plastic. I have seen several posts over the years where the plastic collar has broken.
When I got the clutch kit for my truck it came with a plastic TO collar. I called the company to complain, and they sent me a metal TO bearing assy, at no charge.
One other thing, make sure the disc is the full size 10 inch. I have seen clutch kits that have a 10 inch PP and a 9 1/2 inch disc.
 
Blue62Val said:
Did you need to change the flywheel of bell housing to accomodate the 10" plate ?
Click to expand...
This is the one for the Mopar 122 tooth flywheel for both the 273, early 318 and slant 6. Look at how the pressure plate housing is "pushed out" around the bolt holes. That's how you are able to get that extra 1/2" of diameter disc in there.

PLYMOUTH Zoom Performance Products MU1525-1 Zoom MU Series Clutches | Summit Racing

Free Shipping - Zoom MU Series Clutches with qualifying orders of $109. Shop Clutch Kits at Summit Racing.
www.summitracing.com
 
RustyRatRod said:
This is the one for the Mopar 122 tooth flywheel for both the 273, early 318 and slant 6. Look at how the pressure plate housing is "pushed out" around the bolt holes. That's how you are able to get that extra 1/2" of diameter disc in there.

PLYMOUTH Zoom Performance Products MU1525-1 Zoom MU Series Clutches | Summit Racing

Free Shipping - Zoom MU Series Clutches with qualifying orders of $109. Shop Clutch Kits at Summit Racing.
www.summitracing.com
Click to expand...
Yep. The scalloped pressure plate uses socket head cap screws. You use an Allen wrench or hex driver and not a wrench. They must have small heads to fit and work properly. (you know but many of the readers here may not)

clutch kit 004.jpg
 
j par said:
And it should only cost about ten bucks, and it should take a machine shop ten minutes while you wait..
Click to expand...
Blanchard ground or non directional finishes take 30 min or more.

clutch kit 007.jpg
 
mopardude62 said:
This is what the Auburn style 9.5” clutch looks like.

I have done the swap on my 1967 Barracuda, you can replace the Auburn pressure plate with the 10” Borg & Beck pressure plate and 10” clutch disk.

The 10” B&B pressure plate uses the same flywheel, bellhousing, z-bar and clutch fork. The only thing you will need is three extra shouldered bolts to hold the pressure plate to the flywheel. Brewer’s has them!

View attachment 1716350059
Click to expand...
Wow, I guess I never saw the original pressure plate in my 65. I was still a teenager when the original clutch in my 65 wore out at 90K, and my Dad let a couple different shops install replacement clutches. They were six cylinder clutches and didn't last long. My frustration about them was one of the things that led me to start doing my own mechanical work. That and things breaking from bolts not being tightened, etc.
 
toolmanmike said:
Yep. The scalloped pressure plate uses socket head cap screws. You use an Allen wrench or hex driver and not a wrench. They must have small heads to fit and work properly. (you know but many of the readers here may not)
Click to expand...

the bolt must also be shouldered to fit the pressure plate holes. standard threaded aren't close enough tolerance and will cause vibration or shear off.

fwiw, the bolts i'm running aren't socket head, they're hex head cap screw like 3/8 head.
 
junkyardhero said:
the bolt must also be shouldered to fit the pressure plate holes. standard threaded aren't close enough tolerance and will cause vibration or shear off.

fwiw, the bolts i'm running aren't socket head, they're hex head cap screw like 3/8 head.
Click to expand...
They also have a shoulder that fits counterbores in the flywheel to be stronger in shear.
 
junkyardhero said:
the bolt must also be shouldered to fit the pressure plate holes. standard threaded aren't close enough tolerance and will cause vibration or shear off.

fwiw, the bolts i'm running aren't socket head, they're hex head cap screw like 3/8 head.
Click to expand...
Like header bolts. The clutch came with bolts. I hope they were shouldered.
 
RustyRatRod said:
This is the one for the Mopar 122 tooth flywheel for both the 273, early 318 and slant 6. Look at how the pressure plate housing is "pushed out" around the bolt holes. That's how you are able to get that extra 1/2" of diameter disc in there.

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Click to expand...
Well Rat Rod…..you’ll be glad to know I simply bit the bullet and ordered one of these from Rock Auto.
I’ll let you know how it goes.
At the moment I’m simply after something to get me going again……even though the box is out at the moment and I’m cleaning it up.

Thanks everyone for the replies - it really helped.
 
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