1970 F-41 rear sway bar [Archive] - Chevy Nova Forum

: 1970 F-41 rear sway bar


NOVAJET
19th-January-2010, 10:28 AM
I just picked up a 1970 big block project. When I had it on the hoist I noticed the rear sway bar was a larger diameter than the small block one I have. Is this normal or could someone have added it. It has the factory mounts on the bottem of the trunk floor and the 1970 links from the trunk floor to the sway bar. Thanks

3DTim
19th-January-2010, 11:29 AM
Need some pic's but could be. I have two but both are Pontiac.

406Boy
20th-January-2010, 12:26 AM
No that's all factory stuff on the Big Block Cars. Front bar should be 13/16 in diameter if I'm not mistaken. The rear one I'm not sure of the size but yes it is factory. Also should have 4 leaf rear springs as opposed to the small block cars which had 5 leafs. Sounds backwards but that how they made them.

L78 Nova
20th-January-2010, 08:45 AM
I've heard there were two X body rear bar diameters but I thought only the GTO's had the larger size?

On the leafs... My 1970, F41, L78 had a five leaf pack and it was an unmolested original.

Gary

YENKO DEUCE REG
25th-January-2010, 01:14 PM
The F41 Nova front & rear bars are the same size regardless of engine size.

M

Schonyenko2
25th-January-2010, 10:49 PM
70 F41 has a 5 leaf stack for both SB and BB. There is some who believe that there may have been some 69s that had a 4 leaf stack. That's still a discussion subject looking for more evidence.
The thicker 4 leaf stack was designed for Z28 application.
There can be a diameter difference in front sway bars on Camaros, but it doesn't transfer over to the Novas even though they use pretty much the same frt stub.

NOVAJET
26th-January-2010, 12:36 PM
The F41 Nova front & rear bars are the same size regardless of engine size.

M

I got a 1970 assy. manual today and they show a #3890996 shaft (rear swaybar) for a L48 car and a shaft # 3980997 shaft for L34 and L78. They also show two different part numbers for each rubber bushing according to engine size. I can only assume that this is because of diameter. The leaf springs are a stack of five but not sure springs are original. Is there any clues to tell? The front sway is 13/16".

L78steve
29th-January-2010, 01:33 PM
If you look at the rear springs carefully on the sides of the springs there will be a Raised GM. Hard to see but I noticed it when I bead blasted mine. The orig. springs are tapered, meaning the width increases toward both ends. This taper is not on the top spring due to the round ends for the bolt mounts.From what I know (which may not be much) F-40 had the 4 leaf packs, F41 5 leaf. No F41 prior to March 1970. F-40 @ F41 BB Novas get the 13/16 front bar. Oddly BB 69 Camaros and Z28s do not get the 13/16 front bar.

YENKO DEUCE REG
29th-January-2010, 01:58 PM
I got a 1970 assy. manual today and they show a #3890996 shaft (rear swaybar) for a L48 car and a shaft # 3980997 shaft for L34 and L78. They also show two different part numbers for each rubber bushing according to engine size. I can only assume that this is because of diameter. The leaf springs are a stack of five but not sure springs are original. Is there any clues to tell? The front sway is 13/16".


I trust you, but in reality they probably never produced what the manual states. To our knowledge, there is only one diameter bar for the rear - for both SB and BB's.

BTW, my previous post was vague, obviously the front and rear bars are not the same diameter, but each is the same diameter when comparing SB and BB's

:)

L78steve
29th-January-2010, 04:34 PM
I trust you, but in reality they probably never produced what the manual states. To our knowledge, there is only one diameter bar for the rear - for both SB and BB's.

BTW, my previous post was vague, obviously the front and rear bars are not the same diameter, but each is the same diameter when comparing SB and BB's

:)

The Nova front BB bar is 13/16 which is larger than the SB 11/16. This I know for sure.

NOVAJET
29th-January-2010, 10:06 PM
Tonight I went out to the shop with a caliper. I measured a set of sway bars from a 70 SS 350 13/16" front 5/8" rear. I had another set from a 71 SS 350 13/16" front and 5/8" and the set from this 70 SS 396 was 13/16" front and 11/16 rear. Has any of you with a 70 BB car seen this before or did one of the previous owners change it from something else. It sure looks like factory equipment.

Mr. Nickey Nova
2nd-February-2010, 07:17 PM
My 70 BB survivior has a 11/16 size front bar and my 72 SS which still retains it's original F41 setup has a 13/16 front bar and a 5/8 rear bar.So, i would have to say that Marlin is correct on the two different sizes,front to rear.Anyone else have a 11/16 front bar on there original BB Nova??

jrsully
2nd-February-2010, 07:38 PM
I will check my 70 L78 rear bar tomorrow,originally came with 4 leafs as well

Steves 70SS
2nd-February-2010, 07:38 PM
Not to jack the thread but does anybody know where I can get a bar and ends for one.My car has the brackets but nothing else.


Steves70ss

jrsully
2nd-February-2010, 08:11 PM
there is 1 or 2 on ebay now (don't think they are 100% correct) but very close. Original 70 Nova rear bar set ups go for BIG ****. I sold a complete set up 5 years for $900 to somebody doing an original Deuce. Rarely do you find the whole set up in one shot

taz3
2nd-February-2010, 08:20 PM
My 70 BB survivior has a 11/16 size front bar and my 72 SS which still retains it's original F41 setup has a 13/16 front bar and a 5/8 rear bar.So, i would have to say that Marlin is correct on the two different sizes,front to rear.Anyone else have a 11/16 front bar on there original BB Nova??

My 69's both have 11/16 front sway bars, with factory 5 leaf rear set up.

The F41 was heavy duty optional rear suspension, with the sway bar and 4 leaf Big or Small Block. The 5 leaf set up was the upgraded option from the Mono leaf, all were available on all models.

NOVAJET
2nd-February-2010, 10:08 PM
I think I read somewhere that when you got the F41 suspension (in 1970) you got the larger 13/16" front sway bar along with the rear sway bar. Is this correct?

taz3
2nd-February-2010, 10:24 PM
From what I know the F41 front and rear sway bar was introduced later during the 70 model year, so it would make to increase the front sway bars too. The F41 suspension didn't involve the sway bars in 69, so it makes sense that when they added the rear bar the 13/16" front bar was an upgrade. GM was still learning at the track and applying this technology to street cars. The Z28 would have been the mule for this in the Trans Am series.

YENKO DEUCE REG
3rd-February-2010, 01:49 PM
I think I read somewhere that when you got the F41 suspension (in 1970) you got the larger 13/16" front sway bar along with the rear sway bar. Is this correct?

This is true. F41 is bars and shocks for SS only (unless its a COPO) and F40 is springs. I don't believe you could get both on the same car, but.... never say never!

M

L78steve
4th-February-2010, 07:01 PM
In 1970, F-40 was included with the 396 option. F-40 used the 13/16 front bar. It may be so that F-40 could be ordered with the SB also. That would explain the 13/16 front bar on the SS SB's listed above.

Steves 70SS
12th-February-2010, 07:22 PM
Can any of you guys post a picture of the bottom leaf spring plate. I have the mounts for the sway bar and would like to find one some day but also would like to know what the plates look like.I'm not sure if I have the right ones.

thanks, Steves70ss