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nb2841 02-14-2013 09:07 PM

Back shocks
 
I have a 1967 nova with a 327, it has always had a floater suspension. I am taking it to the chassis shop tomorrow to put double adj Alfco under it. It weighs 3200 with me in it. What lbs springs should I run in the back? It's a 14x32 tire car. Thanks in advance.

Tom Goldman 02-14-2013 10:02 PM

Re: Back shocks
 
Assuming the shocks are behind the rear and you have an approximate axle weight of 1450# or about 45% , I'd start with a 130# spring.
I always prefer to use a lighter spring and have to load the spring to attain the proper shock center distance.

nb2841 02-14-2013 10:08 PM

Re: Back shocks
 
yes the shocks will be placed in behind the rear 9" housing. And they are 12" shocks.

SCOTT TILLEY 02-15-2013 07:10 AM

Re: Back shocks
 
I have a '65 ChevyII I run in Super Stock Production with IHRA. It weighs 3030 with me in it. I use a 110 spring. Shocks are behind the rearend. I used a 95# spring for years. I thought maybe the shocks were bottoming out after talking with several racers on what spring I should be using. Turns out that I had no on track performance gain with the 110 spring. Same 60 foot of a 1.31-1.33 with a 327 2 bbl. I did notice the rear was much stiffer with the 110 riding through the pits.

Scott Tilley
IHRA SS/PDAII

curtis reed 02-15-2013 08:12 AM

Re: Back shocks
 
Here is a nice little spring rate guide from Afco. I would have the chassis shop scale the car if you haven't so you would know the actual weight on the rear.

http://static.speedwaymotors.com/ima...rts/AFCOIL.gif

Larry Hill 02-17-2013 09:42 AM

Re: Back shocks
 
Thanks Curtis, very good info.


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