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> Bumper change, 75 to pre 75 bumper
Micky M.
post Feb 5 2025, 05:58 AM
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Hi there,
I'm in the progress of swapping my 75 rubber bumper to the pre 75 steel bumper version.
In order to do it right I need the diameter of the holes to be drilled for the pre 75 bumper mounts.
It would be extremely helpfull if somebody who owns a pre 75 car could give me the exact measurements of the location of the mounting holes.

Thanks a lot!

greetings from Germany....
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Craigers17
post Feb 5 2025, 06:29 AM
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Entire thread on it. I believe the answer you're looking for is in posts #2 & #3. Good Luck. This has to be one of the top 5 914 upgrades.


http://www.914world.com/bbs2/index.php?showtopic=225743
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mepstein
post Feb 5 2025, 07:32 AM
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Actually quite a few threads on it. Pretty easy update/backdate. The holes are sized for the bolts that hold on the bumpers. Mx10 I believe but I could be wrong. The other trick is to use studs in the bumpers instead of blots. Makes it a bit easier to install on the car.
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dr914@autoatlanta.com
post Feb 5 2025, 11:25 AM
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QUOTE(Craigers17 @ Feb 5 2025, 05:29 AM) *

Entire thread on it. I believe the answer you're looking for is in posts #2 & #3. Good Luck. This has to be one of the top 5 914 upgrades.


http://www.914world.com/bbs2/index.php?showtopic=225743



one of the top 5 914 DOWN grades, don't do it
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Craigers17
post Feb 5 2025, 11:33 AM
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QUOTE(dr914@autoatlanta.com @ Feb 5 2025, 12:25 PM) *

QUOTE(Craigers17 @ Feb 5 2025, 05:29 AM) *

Entire thread on it. I believe the answer you're looking for is in posts #2 & #3. Good Luck. This has to be one of the top 5 914 upgrades.


http://www.914world.com/bbs2/index.php?showtopic=225743



one of the top 5 914 DOWN grades, don't do it


Yeah…..nobody wants their 914 to both look way better AND be 50 or so lbs lighter. (IMG:style_emoticons/default/screwy.gif)
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mepstein
post Feb 5 2025, 12:16 PM
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Yea, Porsche designed the 914 to look like 70-74. Big bumpers were made to meet fed impact standards. I’m not saying they are ugly or 75-76 owners should change them but if you like the original look of a 914, it’s a pretty easy swap.
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Eric_Shea
post Feb 5 2025, 03:01 PM
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Up voting - Upgrade
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930cabman
post Feb 5 2025, 03:37 PM
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great timing, I have been considering the same with my '74 project

thanks to all

once again, this forum totally rocks

(IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beerchug.gif)
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targa72e
post Feb 5 2025, 11:15 PM
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I back dated my 75. I found the measurements in on the rear in the referenced thread to be close but just slightly off on my 75. I have a 73 as well to reference. I mounted the lower valance on the rear and set the taillight in place and then set the bumper where it needed to go.

Attached Image

I used someone else suggestion of short studs and a little dark grease on the dog bones to get the exact locations.
Below are the measurements I got when done. Over all process worked well.

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On front holes are marked as indicated in referenced thread.

I ended up making a whole new front channel as I had some slight rust under the original.

Attached Image

I have changed to studs on my 73 and it makes installation a easy one person job.

Hope this helps.


john
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rfinegan
post Feb 6 2025, 11:29 AM
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I hate the Rear BUBs, But oddly enough, I still like the front BUBS that wedge style front is what left its foot print on styles in the late 70"s
So I just back dated the rear bumper
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Root_Werks
post Feb 6 2025, 11:40 AM
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@rfinegan

Nice SLC! Those are hard to find these days.
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KELTY360
post Feb 6 2025, 01:36 PM
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QUOTE(rfinegan @ Feb 6 2025, 09:29 AM) *

I hate the Rear BUBs, But only enough I still like the front BUBS that wedge style front is what left its foot print on styles in the late 70"s
So I just back dated the rear bumper
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(IMG:style_emoticons/default/agree.gif) That rear bub is ungainly and looks like an afterthought.
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fiacra
post Feb 6 2025, 03:42 PM
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I think this looks pretty damn good. You want to change your bumpers, go ahead. I'll even come over and help you if you need help. it's your car and your money, and frankly I applaud you for doing it. That is your vision, and I respect that and I won't call you (IMG:style_emoticons/default/screwy.gif) or tell you I "hate" how your car looks. (IMG:style_emoticons/default/beerchug.gif)

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mepstein
post Feb 6 2025, 05:18 PM
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I’ve only ever seen one “front dated” (early car with BB’s).
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BillJ
post Feb 6 2025, 05:42 PM
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QUOTE(mepstein @ Feb 6 2025, 06:18 PM) *

I’ve only ever seen one “front dated” (early car with BB’s).

One too (IMG:style_emoticons/default/beerchug.gif) many!!
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jim_hoyland
post Feb 6 2025, 08:46 PM
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I did the rear and kept the original front…


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jim_hoyland
post Feb 6 2025, 08:47 PM
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Front


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targa72e
post Feb 6 2025, 10:25 PM
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My 73 had a updated rear bumper. Front was stock. Update was done less than perfect. I have no idea why it was done. returned to 73 look, which i prefer.
I keep moving the stock bumpers around the garage from my 75, man they are heavy. I don't have the heart to throw them away,,,yet.

john
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mepstein
post Feb 7 2025, 06:43 AM
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I weighed the BB’s years ago. Including the shock mounts, one was 38, one was 42. Early bumpers are around 12-14lbs each. Fiberglass is around 6lbs each.
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