Author Topic: 68 Driver Side Firewall Ground Strap Hole  (Read 1239 times)

vetteskip

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68 Driver Side Firewall Ground Strap Hole
« on: March 25, 2023, 12:24:12 PM »
1968 Z28, driver side valve cover ground strap hole. I have a pieced hole existing on the passenger side firewall, but not the driver side - not sure if I'm looking at this correctly. The car does currently have a radio. Any thoughts?
Unrestored 1969 Z28 X33D80, original drivetrain
1968 Z28 original drivetrain

cook_dw

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #1 on: March 25, 2023, 12:50:25 PM »
Is your Z a NOR or LOS?  My 68 12D LOS car also does not have the piercing but was an original AM front antenna car.  But my 03D L78 NOR car was U63/U73 and it has the ground strap.

David K

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #2 on: March 25, 2023, 02:52:28 PM »
That is for a 6 cylinder application. See pictures.

cook_dw

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #3 on: March 25, 2023, 03:27:55 PM »
Try again.  U63 calls for it as well.  AIM attached along with 68 03D NOR U63/U73.



David K

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #4 on: March 25, 2023, 04:20:39 PM »
Do I get 1/2 credit? And by the way, Mr. Preservation 👍👍👍, thatís the first time I can recall a dual purpose firewall hole.
Added the all important firewall hole piercing page.

vetteskip

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #5 on: March 25, 2023, 04:24:43 PM »
The car is a Norwood car. I've seen a few different pictures of straps installed, most similar to the pic above (cook_dw). My thought was that they may have forgot to install the driver side strap originally on this car (?). If that's the case, I prefer to not open up a hole putting a new strap in place.
Unrestored 1969 Z28 X33D80, original drivetrain
1968 Z28 original drivetrain

David K

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #6 on: March 25, 2023, 04:43:24 PM »
If the car was originally equipped with a radio, the ground strap would have been there. However, after looking at the Skips pictures, it appears thereís some work of some sort thatís been done to that area. Looks like some filler where the oil line comes through, and perhaps the screw is just broken off in the hole.

169INDY

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #7 on: March 25, 2023, 09:16:01 PM »
My 1968 (LOS) 12/26/1967 Built V8 Car is also not pierced per the AIM.
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

169INDY

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #8 on: March 25, 2023, 09:24:33 PM »
Red Arrow Unpierced ground screw hole.
Blue Circle Pierced ground screw hole.
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

vetteskip

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #9 on: March 26, 2023, 09:48:10 PM »
All good info, thanks for the replies!
Unrestored 1969 Z28 X33D80, original drivetrain
1968 Z28 original drivetrain

cook_dw

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #10 on: March 26, 2023, 10:56:25 PM »
Jimís car and my 12D LOS car has the same hole just below the mounting surface.

169INDY

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #11 on: March 28, 2023, 03:53:34 AM »
Adding this photo as reference to the thread
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

vetteskip

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Re: 68 Driver Side Firewall Ground Strap Hole
« Reply #12 on: March 28, 2023, 12:37:42 PM »
Thanks for the replies and thoughts! After seeing some of the pics above, I do have a screw hole down lower from the dimple area (as noted by INDY & COOK) and that is where I will install the ground strap. The dimpled area where the manual says to mount, and where some of the guys posted pics of the screw installed, never has the ground strap screw installed on my car (just a very small, not even 1/8" hole is present after cleaning it down - not sure if that was from the dimple or someone had something installed there once). Thanks again.
Unrestored 1969 Z28 X33D80, original drivetrain
1968 Z28 original drivetrain