Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Fiberglass Bumper Conversions Underway

 
Old 01-09-2019, 11:17 PM
  #1  
Strokemyaxe
CF Senior Member
Thread Starter
 
Strokemyaxe's Avatar
 
Member Since: Jul 2014
Location: Arlington TX
Posts: 736
Received 42 Likes on 41 Posts
Default Fiberglass Bumper Conversions Underway

Dub Style Fitment - Day one.
Piece 1 of 7 (Front bumper, Flares and Hood to Follow)
Removed factory rear bumper and crash equipment.
Tape on new bumper for general test fit.

I believe there were 35 screws and/or bolts in all that needed to be removed to disassemble the rear bumper on my 77. I sprayed the bolts that hold the urethane bumper to the body with blaster to help work them loose. Its a tight fit and I mainly used my Harbor Freight ratcheting wrenches to get the 3/8" nuts off half of the bolts. The other half had enough room for an air ratchet. Half of the bolts I removed by ratcheting wrench ended up snapping the bolt just before the last 5-6 (out of maybe 100) partial turns needed to remove the nut. In retrospect, I could have saved myself a lot of time and not used Blaster on any of them. That way they all would have just snapped off after 3-4 good Oogah Doogahs. Everything else with the crash bar came apart quite easily with very easy access to all the nuts and bolts. Needed a backing wrench on 12 of them, and I used a breaker bar with an 11/16" socket on the opposite side of my air ratchet. Crash bar is HEEEEAVY.. Wasn't prepared almost reset the "Days Without Accident" board to zero. Honestly, I knew I would be giving up that bar, but it sort of made me a little uneasy feeling the actual weight of how much protection I was giving up. But, I'll fab up a very sturdy, albeit thinner, crash bar to fit behind the new bumper for peace of mind.

Altogether with removing bumper and taking pics of new one was about 3 1/2 Hours of work.

I will update as I proceed.

Thanks for watching!
Stroke





Last edited by Strokemyaxe; 01-09-2019 at 11:20 PM. Reason: Credit
Strokemyaxe is offline  
Old 01-10-2019, 06:50 AM
  #2  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 4,917
Received 637 Likes on 590 Posts
Default

This is a DUB thread about his method of making the bumper match the car. https://www.corvetteforum.com/forums...-corvette.html
derekderek is online now  
Old 01-10-2019, 11:58 AM
  #3  
Strokemyaxe
CF Senior Member
Thread Starter
 
Strokemyaxe's Avatar
 
Member Since: Jul 2014
Location: Arlington TX
Posts: 736
Received 42 Likes on 41 Posts
Default

Originally Posted by derekderek View Post
This is a DUB thread about his method of making the bumper match the car. https://www.corvetteforum.com/forums...-corvette.html
Thanks for that link. I spoke with him for about 45 minutes yesterday before I got started on everything. Very helpful. I will indeed be following that method to get a near-seamless fit (hopefully). I have the luxury of not needing to preserve my paint on the body, so I may do some things a little different, but overall, it will be the same method.

-Stroke
Strokemyaxe is offline  
Old 01-10-2019, 12:43 PM
  #4  
540 vette
CF Senior Member
 
540 vette's Avatar
 
Member Since: Jan 2002
Location: Commack NY
Posts: 9,771
Received 141 Likes on 116 Posts
Default

People talk about removing the safety bars on these cars. I did it on my 80 and 77 when I did fiberglass bumpers. No protection. Well I just removed the bumpers from my 72. and if people think that those little skinny bumpers and the couple of braces are protection I don't see them as that. If you get hit in one of these cars at 40 or 50 you are going to get hurt. I don't care if you have those supports or the chrome bumper kind.

Last edited by 540 vette; 01-10-2019 at 12:44 PM.
540 vette is offline  
The following users liked this post:
Priya (01-14-2019)
Old 01-10-2019, 02:21 PM
  #5  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 4,917
Received 637 Likes on 590 Posts
Default

The only down side is the car has had what NTSB considers safety equipment removed. If you get rear ended in a 77 with 72 tail panel and bumpers, they could say you shoulda left that iron in the car. But I am going to do it anyway with my 75.
derekderek is online now  
Old 01-10-2019, 02:49 PM
  #6  
540 vette
CF Senior Member
 
540 vette's Avatar
 
Member Since: Jan 2002
Location: Commack NY
Posts: 9,771
Received 141 Likes on 116 Posts
Default

Originally Posted by derekderek View Post
The only down side is the car has had what NTSB considers safety equipment removed. If you get rear ended in a 77 with 72 tail panel and bumpers, they could say you shoulda left that iron in the car. But I am going to do it anyway with my 75.
They aren't going to say anything. Unless someone says something. And then thats the way I bought the car.


540 vette is offline  
Old 01-11-2019, 06:11 PM
  #7  
jkippin
CF Senior Member
 
jkippin's Avatar
 
Member Since: Feb 2014
Location: Cape Neddick Maine
Posts: 650
Received 48 Likes on 40 Posts
Default

Following along. You are going to like the look when done
jkippin is offline  
Old 01-11-2019, 06:32 PM
  #8  
Vette5311
CF Senior Member
 
Vette5311's Avatar
 
Member Since: Mar 2018
Location: Golden Colorado
Posts: 1,343
Received 162 Likes on 152 Posts
Default

I like the plan. I'll be watching. I was considering another C3 bumper car as a driver but prices to high for a driver. A later C3 with early look may be a plan. More pics please.
Vette5311 is offline  
Old 01-11-2019, 06:53 PM
  #9  
The13Bats
CF Senior Member
 
The13Bats's Avatar
 
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,606
Received 730 Likes on 623 Posts
Default

Originally Posted by Strokemyaxe View Post
Dub Style Fitment - Day one.
Piece 1 of 7 (Front bumper, Flares and Hood to Follow)
Removed factory rear bumper and crash equipment.
Tape on new bumper for general test fit.

I believe there were 35 screws and/or bolts in all that needed to be removed to disassemble the rear bumper on my 77. I sprayed the bolts that hold the urethane bumper to the body with blaster to help work them loose. Its a tight fit and I mainly used my Harbor Freight ratcheting wrenches to get the 3/8" nuts off half of the bolts. The other half had enough room for an air ratchet. Half of the bolts I removed by ratcheting wrench ended up snapping the bolt just before the last 5-6 (out of maybe 100) partial turns needed to remove the nut. In retrospect, I could have saved myself a lot of time and not used Blaster on any of them. That way they all would have just snapped off after 3-4 good Oogah Doogahs. Everything else with the crash bar came apart quite easily with very easy access to all the nuts and bolts. Needed a backing wrench on 12 of them, and I used a breaker bar with an 11/16" socket on the opposite side of my air ratchet. Crash bar is HEEEEAVY.. Wasn't prepared almost reset the "Days Without Accident" board to zero. Honestly, I knew I would be giving up that bar, but it sort of made me a little uneasy feeling the actual weight of how much protection I was giving up. But, I'll fab up a very sturdy, albeit thinner, crash bar to fit behind the new bumper for peace of mind.

Altogether with removing bumper and taking pics of new one was about 3 1/2 Hours of work.

I will update as I proceed.

Thanks for watching!
Stroke




Wow, sure looks better with that ugg bologna cut tail off there and a sweet duck tail in its place....
The13Bats is offline  
The following users liked this post:
Strokemyaxe (01-11-2019)
Old 01-11-2019, 06:56 PM
  #10  
Vette5311
CF Senior Member
 
Vette5311's Avatar
 
Member Since: Mar 2018
Location: Golden Colorado
Posts: 1,343
Received 162 Likes on 152 Posts
Default

Just out of curiosity what does the OEM crash piece weigh? Thx
Vette5311 is offline  
Old 01-11-2019, 10:34 PM
  #11  
Strokemyaxe
CF Senior Member
Thread Starter
 
Strokemyaxe's Avatar
 
Member Since: Jul 2014
Location: Arlington TX
Posts: 736
Received 42 Likes on 41 Posts
Default

Originally Posted by Vette5311 View Post
Just out of curiosity what does the OEM crash piece weigh? Thx
70lbs
Strokemyaxe is offline  
The following users liked this post:
Vette5311 (01-11-2019)
Old 01-12-2019, 09:16 AM
  #12  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 4,917
Received 637 Likes on 590 Posts
Default

iwasme does have a point. he stated it a little too bluntly, but if pissing you off makes you look harder into reinforcing the rear of the car, he really did not do you wrong. I am soon going to start the same mod on my 75. those bumper shocks add about 4 inches in length. can the impact bar be attached right to the frame? then maybe a little trimming on the 4 bumperrette pieces may make the tail panel fit over it. the taillight holes probably will not be in the exact right place, though. or maybe a piece of 2 by 3 square tubing. something like boat trailer frame and see how much needs to be trimmed off the ends so that that will fit back there.
derekderek is online now  
Old 01-12-2019, 10:13 AM
  #13  
JVetthead
CF Senior Member
 
JVetthead's Avatar
 
Member Since: Jan 2005
Location: San Leon TEXAS
Posts: 977
Likes: 0
Received 7 Likes on 3 Posts
Default

Here is what I did for bumpers. a lightweight solution
https://www.corvetteforum.com/forums...er-suport.html

Last edited by JVetthead; 01-12-2019 at 10:28 AM.
JVetthead is offline  
Old 01-12-2019, 10:18 AM
  #14  
jkippin
CF Senior Member
 
jkippin's Avatar
 
Member Since: Feb 2014
Location: Cape Neddick Maine
Posts: 650
Received 48 Likes on 40 Posts
Default

(Edit)

OK paraphrasing here but I really hope you keep the pictures coming and this thread doesn't get off track like some have in the past.

I did this conversion like others here and I am very happy with the outcome.
My goal was to drop weight from the bumper supports-not a whole lot of room back there.
You may add an aluminium brace and change out the fuel tank to a fuel cell with absorbent foam inside, but not to get off track here

John

Last edited by vettebuyer6369; 01-13-2019 at 12:29 AM. Reason: remove check baggage comment
jkippin is offline  
Old 01-12-2019, 10:52 AM
  #15  
dtamustang
CF Senior Member
 
Member Since: Nov 2007
Location: hernando fl
Posts: 683
Received 34 Likes on 28 Posts
Default

i agree with jkippen keep the pictures coming , if you feel the need to go off on a tangent , start a separate thread so this doesn't get off track. i know there are some people that would rather see the process. everyone that has had anything to say on the other side of this has already said it , no need to go down that road again
dtamustang is offline  
Old 01-12-2019, 11:36 AM
  #16  
jkippin
CF Senior Member
 
jkippin's Avatar
 
Member Since: Feb 2014
Location: Cape Neddick Maine
Posts: 650
Received 48 Likes on 40 Posts
Default

hope this link may help some here
https://www.corvetteforum.com/forums...d-build-3.html
jkippin is offline  
Old 01-12-2019, 12:33 PM
  #17  
Jeff k
CF Senior Member
 
Member Since: Oct 2016
Location: Ashtabula Ohio
Posts: 119
Received 29 Likes on 27 Posts
Default

Keep the pictures coming! I need the motivation to continue with my conversion as well!
John's " badass" car gave me the inspiration to convert my 76, and he hooked me up (Edited) If I can't accept responsibility, at least I know who to blame
Thanks guys!!!!!!!

Last edited by vettebuyer6369; 01-13-2019 at 12:30 AM. Reason: removed Non Supporting Vendor
Jeff k is offline  
The following users liked this post:
jkippin (01-12-2019)
Old 01-12-2019, 01:10 PM
  #18  
97C5
CF Senior Member
 
Member Since: Apr 1999
Location: Austin Texas
Posts: 363
Received 10 Likes on 10 Posts

Default

On mine, I ran a piece of 1 5/8 chrome moly across the back and bent the ends to weld to plates bolted to the factory bumper mounts. Fit nicely under the rear fascia and provides some additional protection. (you said you were going to add something back there as well)
97C5 is offline  
Old 01-12-2019, 08:14 PM
  #19  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 4,917
Received 637 Likes on 590 Posts
Default

This mod is different. AND replacing the impact structure you remove is an integral part of this mod. It can not be overstated. It is not being a know-it-all. It is not DUB on his high horse.
derekderek is online now  
Old 01-12-2019, 09:40 PM
  #20  
ratflinger
NCM Grand Opening Veteran
Support Corvetteforum!
 
ratflinger's Avatar
 
Member Since: Sep 2005
Location: Obscurification is a practicable art!
Posts: 14,991
Received 44 Likes on 37 Posts
St. Jude Donor '11, '17
Default

Originally Posted by Strokemyaxe View Post
... Wasn't prepared almost reset the "Days Without Accident" board to zero. Honestly, I knew I would be giving up that bar, but it sort of made me a little uneasy feeling the actual weight of how much protection I was giving up. But, I'll fab up a very sturdy, albeit thinner, crash bar to fit behind the new bumper for peace of mind.
(Removed quoted material edited)

Reading is fundamental - the OP clearly stated that he was putting a bar back in. Surely you will agree that there are stronger, lighter metals that will perform as well in a crash or am I mistaken and a 77 Corvette still holds the pinnacle for rear-end crash protection.

Last edited by vettebuyer6369; 01-13-2019 at 12:43 AM. Reason: Quoted material that was removed
ratflinger is offline  
The following users liked this post:
carriljc (01-21-2019)

Thread Tools
Search this Thread
Quick Reply: Fiberglass Bumper Conversions Underway


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: