Reply
 
Thread Tools Display Modes
  #1  
Old 06-14-2009, 12:23 AM
mlubahn mlubahn is offline
Junior Member
 
Join Date: Jan 2009
Posts: 13
Cool Difference between 70-72 firebird nose and 73??

Hello. Could someone tell me what the difference is between 70-72 nose, and 73? THANKS!

  #2  
Old 06-14-2009, 01:34 AM
Sharkbait40's Avatar
Sharkbait40 Sharkbait40 is offline
Senior Member
 
Join Date: Jan 2007
Location: Phoenix, Arizona
Posts: 148
Default Bumber Differences

73 bumpers are much heavier due the minium imposed Federal 5mph crash standards for bumpers. I think it adds about 35 lbs more then the earlier bumbers. The 73 bumper uses both internal and external braces to achomplish this. The internal brace on the 73 forces the nose tip to extend ablut an 1.5 inches forward of the earlier noses. That also means that the 73 grille inserts are a one year only design and not interchangeable with earlier years. The 73 year bumpers and some late 72's have the bottom of the bumpers notched out at the bottom in 4 places where the plastic type(not metal) valance would attach to. I'll let someone else elaborate on the 70, 71-72 bumbers are I am not as familar with those.

  #3  
Old 06-14-2009, 10:52 AM
bird72's Avatar
bird72 bird72 is offline
Ultimate Warrior
 
Join Date: Jun 2005
Location: The Gila
Posts: 2,318
Default

I didn't know the 73 nose was longer to the point.... learned something... but the structural framework backing it up is beefier. The grille openings are different depths than 70-72 with 73 grilles being inset versus 70-72 grilles going to the front edge of opening.

__________________
72 Bird
  #4  
Old 07-07-2009, 03:39 PM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

Some good info here, but can anybody be more specific? Measurements, pics of differences, etc? My body guy just called and said he isn't too sure about repairing my 72 nose.....the many cracks in the surface keep extending with pressure...so my guess is that even if repaired it would just happen again.

So....he is an hr away, and I don't have the nose in front of me, but I'd like to look for a replacement. I don't want to end up getting a 73.......Can anyone help?

P.S. If anyone has one they don't need...

  #5  
Old 07-07-2009, 04:48 PM
BobC BobC is offline
Senior Chief
 
Join Date: Sep 2000
Location: Blue Springs, MO
Posts: 298
Default

One of the easiest ways for me to tell is the headlight mounting bracket. The '70-'72 is straight on the sides and the '73 is angled. If a '73 owner doesn't send a pic I can drive to where I have some stuff stored and take a pic of a '73 bumper. Check out ebay auction 250458331922 that's currently on ebay. Look at the bracket over the headlight opening in the bumper and compare that to the one on a '70-'72.


Last edited by BobC; 07-07-2009 at 04:54 PM.
  #6  
Old 07-07-2009, 05:03 PM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

Thanks Bob. If I am to understand correctly, when looking at the bumper from behind there is a large bracket sticking straight out (facing rearward) from the top of the headlight opening on the nose. It is molded in and shows clearly in the right hand column of photos in that auction....5th photo down. You are saying that bracket on a 70-72 does NOT have angled sides as the one in the auction does...it would be more of a rectangular shape?

  #7  
Old 07-07-2009, 05:47 PM
BobC BobC is offline
Senior Chief
 
Join Date: Sep 2000
Location: Blue Springs, MO
Posts: 298
Default

Here's a pic of a '71 Formula. The Endura headlight bracket is rectangular in shape. You can see the difference between this one and the one in the ebay auction.
Attached Thumbnails
Click image for larger version

Name:	IMG_0909.jpg
Views:	528
Size:	67.2 KB
ID:	174072  

  #8  
Old 07-07-2009, 06:02 PM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

I sure do Bob. Thanks very much!

Aron

  #9  
Old 07-07-2009, 08:31 PM
Exil Exil is offline
Senior Member
 
Join Date: Jun 2009
Location: Reality on the right
Posts: 146
Default

you can use any 70'-72' grill in any/all 70'-73' noses,
but you can't use a 73' gill in a 70'-72' nose.
There will be a gap in the 70'-72' nose because of the shorter 73' grills. So 73' grills fit 73' noses only.

& yes the cracks will most likely come back. Its one of those things that you must remember not to lean over or put your hand there for suport while working on you motor.

__________________
[SIGPIC][/SIGPIC]
  #10  
Old 07-07-2009, 09:09 PM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

Thanks, thats good info too. But I was told a 73 nose won't bolt to the supports for a 70-72 car....so a 73 nose wont work for me. And I know in general not to lean on the nose to prevent cracking of the paint, but the old nose in this case must have the skin of the endura material hardened, and it too is easily cracking. I'd rather start with a better one.

  #11  
Old 07-07-2009, 11:57 PM
68bird400HO's Avatar
68bird400HO 68bird400HO is offline
Ultimate Warrior
 
Join Date: Aug 2004
Location: Surrounded By Reality
Posts: 2,070
Default

Another easy way I tell them apart is by the bottom lip. On the '70-'72 the bottom edge of the lip is straight. On the '73s, the edge of the bottom lip is not straight. It cuts up in one spot and cuts down to go around each of the bolt holes.

__________________
1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
  #12  
Old 07-09-2009, 01:32 PM
webrunner webrunner is offline
Junior Member
 
Join Date: Oct 2007
Posts: 13
Default

An earlier post refers to the lower 5 holes as being on a 73 only. I take it now that is incorrect?: http://forums.maxperformanceinc.com/...highlight=nose

  #13  
Old 07-12-2009, 09:34 AM
68bird400HO's Avatar
68bird400HO 68bird400HO is offline
Ultimate Warrior
 
Join Date: Aug 2004
Location: Surrounded By Reality
Posts: 2,070
Default

Quote:
Originally Posted by webrunner View Post
An earlier post refers to the lower 5 holes as being on a 73 only. I take it now that is incorrect?: http://forums.maxperformanceinc.com/...highlight=nose
It looks like he is referring to my comment in the previous post. The bottom lip of that red nose in your linked thread is not straight. It dips down to go around the bolt holes. That is '73 only. The lip on the '70 to '72s has the bolt holes but is cut straight across the whole bottom.

__________________
1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
  #14  
Old 07-12-2009, 10:21 AM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

Here are pics of the 70-72 nose I just bought. Headlight bracket, bottom lip, and even lack of support behind center of nose are quite visible to me now.





  #15  
Old 07-12-2009, 11:16 AM
165th's Avatar
165th 165th is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: San Antonio, TX
Posts: 1,352
Default

Aron, congrates on getting a nice front bumper. Another distinguishing characteristic of the '72 bumper is the recesses along the bottom lip to accommodate the plastic lower front valance. I'm not sure if this detail is on the '70, '71 but it is on the '72, '73. In these photos you can still see remnants of a plastic lower front valance bolted to the bumper that were painted over.

If using a metal lower front valance this detail will not be as important.
Attached Thumbnails
Click image for larger version

Name:	72 endura bumper.jpg
Views:	329
Size:	273.0 KB
ID:	174589   Click image for larger version

Name:	72 endura bumper 2.jpg
Views:	320
Size:	234.6 KB
ID:	174590  

  #16  
Old 07-12-2009, 01:18 PM
aronhk_md aronhk_md is offline
Suspended
 
Join Date: Feb 2009
Location: Newark, DE
Posts: 1,254
Default

Good info....was not aware of that. I'm going to have to use the one I have, even though mine is a 72. I'd like to go back to the plastic valance eventually, but I guess I'll have to change the nose again at that time to do it and get a real 72 bumper? Uggghhh!!!.....lol

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:02 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017