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'67-'68 Clutch/Brake Under Dash Shaft
Posted by: donm ()
Date: August 05, 2020 05:42PM

Can someone tell me what the scalloped area on the ’67-’68 clutch/brake shaft is for? When I built my Corv8 back in the day, I had a lot a flexing when using the hydraulic clutch so I’m reinforcing the area now that I’m rebuilding the car. I have it stripped down to the bare shell so it’s hard to tell if it’s intended to provide clearance for something. I installed the steering column and it’s not close, so there must be another reason. Could it possibly be for crash safety? They did a lot of weird things in ’67 to meet safety requirements such as the energy absorbing steering column, holes in dash under pad to crush more easily if an occupant is thrown into it in a crash. Could this be intentional weakening of the shaft for crash safety? I would like to add a bushing and support in this area to help reducing flexing, but don’t want to run into a problem later when I reassemble the whole car and find that it’s there for a reason.



Don M.
Verona, WI (Near Madison)

'67 500 coupe with Crown V8 & Corsa conversion
Bought & built the Corv8 kit in 1970
Currently undergoing a rotisserie restoration
'72 GMC Sierra Grande 402 BB, Short Box, A/C, Owned since 1973

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Re: '67-'68 Clutch/Brake Under Dash Shaft
Posted by: donm ()
Date: August 05, 2020 05:43PM

Not sure what I did wrong, but the pic isn't showing, sorry.

Don M.
Verona, WI (Near Madison)

'67 500 coupe with Crown V8 & Corsa conversion
Bought & built the Corv8 kit in 1970
Currently undergoing a rotisserie restoration
'72 GMC Sierra Grande 402 BB, Short Box, A/C, Owned since 1973

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Re: '67-'68 Clutch/Brake Under Dash Shaft
Posted by: donm ()
Date: August 05, 2020 06:14PM

Try this again

Don M.
Verona, WI (Near Madison)

'67 500 coupe with Crown V8 & Corsa conversion
Bought & built the Corv8 kit in 1970
Currently undergoing a rotisserie restoration
'72 GMC Sierra Grande 402 BB, Short Box, A/C, Owned since 1973

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Re: '67-'68 Clutch/Brake Under Dash Shaft
Posted by: donm ()
Date: August 06, 2020 06:51AM

I figured it out. It's to clear the parking brake cable and clevis where it attaches to the handle. Looks like there's still room to add a support between the scallop area and the threaded end where the clutch pedal arm attaches.

Don M.
Verona, WI (Near Madison)

'67 500 coupe with Crown V8 & Corsa conversion
Bought & built the Corv8 kit in 1970
Currently undergoing a rotisserie restoration
'72 GMC Sierra Grande 402 BB, Short Box, A/C, Owned since 1973

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Re: '67-'68 Clutch/Brake Under Dash Shaft
Posted by: thewolfe ()
Date: August 06, 2020 08:10AM

For what it's worth, here's what I did to solve the flexing issues. First making a beefier bracket with angle iron for the end of the cross shaft under the dash because the stock spot welded one ripped out. Then a plate under the wiper cowl that bolts into that angle piece. It also bolts into the trunk area, making that mounting point solid. This fixed most of the flex but there still was some where the master mounts. Adding a steel plate to that area got rid of it. I assume you are mounting your master in the middle and not next to the brake master?

Nate Wolfe
Portland OR
65 Corsa 180

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Re: '67-'68 Clutch/Brake Under Dash Shaft
Posted by: donm ()
Date: August 06, 2020 08:51AM

I've made similar modifications and yes, I plan to mount the clutch mc near the middle of the cowl.Thanks for the info.

Don M.
Verona, WI (Near Madison)

'67 500 coupe with Crown V8 & Corsa conversion
Bought & built the Corv8 kit in 1970
Currently undergoing a rotisserie restoration
'72 GMC Sierra Grande 402 BB, Short Box, A/C, Owned since 1973

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