Torsion bar size?

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Mick Semantel

Mick Semantel

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I picked up a pair of torsion bars a couple of years ago for my /6 to 360 conversion. The guy said that they where off of a 340 A-body. Is there a way to check if these would be an upgrade from the /6 bars?
 
If they are true 340 bars,they would be a upgrade for Slant 6,273,318 cars.

Torsion bar diameter's:
Slant Six,273,318......810"
340........................870"
383........................890"
 
There should be numbers on the end of them.
Let us know what the numbers are,and we should be able to give you a answer.
Or google the number and see what you come up with.
 
Mick Semantel said:
The numbers are .892 and .893 with the designation of the side they are supposed to be installed on.
Click to expand...


892 & 893 are the last three numbers of the part number.
Example: P3704892

The bar's have paint splotches to identify side.
2 paint splotches = left side
1 paint splotch = right bar.

R means right side or (passenger side).
L means left side or (drivers side).

Bars on right side generally have a even number.
Bars on left side generally have a odd number.

Cant do all your homework !!!!! LOL
Hit your google up and find what your part #'s are,
 
Cant do all your homework !!!!! LOL
Hit your google up and find what your part #'s are,

Crap, I was hoping you wouldn't see through my plan LOL, I appreciate your help. I'll dig around. I'm at home with a sick 2 year old.
 
This is just my 2 cents, most of the people that drag race with us, install slant/6 bars in there cars. We did this with A 13.sec V8 Duster Helped alot with the launch, cuz the waight transfer was much better. If it's A big block street driver not recommended!! The bigger the bar, less movement more strenth. Not much weight on front end at the drags. Giong to look for more pennys, hope this helps someone Don.
 
I have a 360 driver. no tracks even close to my house. I drove all over last summer with the /6 bars. I figured I better put the other bars in this summer.
 
Those numbers are for .870 bars. Standard issue for 340 cars and 318 cars w/ ac, ps, pdb. If you are running .850 bars now, then yes they will be an upgrade. A front sway bar would help you out a bunch as well.
 
Johnny Dart said:
If they are true 340 bars,they would be a upgrade for Slant 6,273,318 cars.

Torsion bar diameter's:
Slant Six,273,318......810"
340........................870"
383........................890"
Click to expand...

The .810's are \6 only at least for 67 up. 273, 318 and heavy duty \6 are .850.

FWIW, the .890 bars are a nice upgrade for \6 or small blocks.
 
Hi y'all,

I just found this thread. I have a pair of the 340 bars. I am putting in my 67 cuda. I am building a 360 / 4 speed setup for it, and i am using a lot of aluminum parts. Heads, intake, radiator, transmission case , bellhousing etc. to get the weight off the front end.

Wouldent taking several hundred pounds out of the front end make the .870 bars i have in effect act like a higher performance bar?

Thanks
Matt
 
removing weight off the front will definitely help.
i installed an nos set of .890's in a Dart in 2004 and it was still "oozy"
i am running .920's in my current Dart and they are an improvement
..these cars were all badly undersprung back in the day and the stock suspensions were barely adequate.
 
moparmat2000 said:
Hi y'all,

I just found this thread. I have a pair of the 340 bars. I am putting in my 67 cuda. I am building a 360 / 4 speed setup for it, and i am using a lot of aluminum parts. Heads, intake, radiator, transmission case , bellhousing etc. to get the weight off the front end.

Wouldent taking several hundred pounds out of the front end make the .870 bars i have in effect act like a higher performance bar?

Thanks
Matt
Click to expand...

Yes, you're looking at shaving 100-150 lbs, maybe a tad more off the front end. Fiberglass bumpers, hood and such, double that. Heck, I'm saving about 100 just swapping out the big heavy front bumper on my 74 to a fiber glass and aluminum brackets. combined, they weigh about 9 lbs,
 
A-Body Torsion Bar Info
DIA Rate Old part number Part Number fits
0.81 90#/in P5249148 drag bars
0.83 92#/in 2071622-3 2535888-9 slant six bars
0.85 101#/in 2071624-5 2535890-1 slant six w/air - 318 w/o air
0.87 110#/in 2071626-7 2535892-3 or P5249149 318 w/ air - 340 std bars
0.89 120#/iin 2071628-9 2535894-5 or P5249150 383 std bars
0.92 150#/in P5249151 *h/d handling
0.99 200#/in P5249152 solo/road race
1.04 250#/in P5249153 h/d solo road race-oval track
1.09 300#/in P5249154 oval track 1/4 mi--optional 1/2 mi
1.14 300#/in P5249155 oval track 1/4 and 1/2 mile *
 
Honestly if it's driver w/ no track time expected go for 1" or better bars. If the .89s are cheap or free go for it, but the bigger bars are sooo much nicer for the road. I've got 1.06 bars and want bigger.
 
Agree on the bigger bars. I put 1.03 bars on my 64 and it was a huge improvement but I wouldn 't mind if it was even a bit stiffer. Good shocks and a sway bar with the large bars make they old squishy boat ride go away.
 
I think for now i will paint and install the .870s as i have them. I am using polyurethane bushings all around, tubular UCAs and boxed lowers, and a hellwig 1&1/4" sway bar. Plus the front end diet plan. The thicker bars make perfect sense, but can be easily swapped at a later date, unless i luck upon a set for a good deal, then i will snap em up.

Btw a buddy of mine here in Abilene is a dyed in the wool mopar nut, turned me onto this site. He showed me a torsion bar that nascar teams used back in the winged car era. I think it was the largest diameter torsion bar built. Something like 2.0" diameter. The bar diameter was thicker than the hexes at either end. He is building a winged car #71 K and K insurance sponsered daytona replica starting with a 70 charger burned out shell. He showed me the trickery the teams all did back in the day with C body LCAs cutting and sectioning them to make them into B body dimensions . This was to use the larger C body hex sockets to fit these huge assed torsion bars. Also they made the rear hex sockets unboltable and removable to slide these huge bars into the frame. Just some cool old history y'all might get a kick out of.

Thanks for all the information.
Matt
 
Matt,
.870 bars are designed for a small block. Slap them in with a nice set of shocks.
You will be fine.:thumbrig:
 
Thanks johnny. I have a set of 4 bilsteins for this car. With a lightened up 360 i am planning to build i am hoping to lose 200 lbs from the front end and that this will make em stiffer and act like .890 big block bars would act if used these in an all iron engined small block A body.
 
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