CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: crossfire on August 16, 2014, 02:47:30 AM

Title: front coil springs for L-89 with alum heads
Post by: crossfire on August 16, 2014, 02:47:30 AM

What were the coil spring  specs for a 68  with L-89 / alum heads, heater delete, manual steering  4 speed

Title: Re: front coil springs for L-89 with alum heads
Post by: janobyte on August 16, 2014, 03:36:05 AM

Want exact ? Four point scale the car with normal load (passengers ,full fuel tank, etc ) compare the results to Eaton spring recommendations. Rule of thumb an aluminum headed big block=cast iron headed small block ,all things being equal with accessories for street. Don't have access to a 4 wheel scale? Give them a call and see what they say.


Spring rate is very important (front, rear) based on what you are doing with the car. Finding  load and demand is a must in determining rate for your particular application.

QA-1 tech is another great source in determining the proper spring for your build.

Title: Re: front coil springs for L-89 with alum heads
Post by: ban617 on August 17, 2014, 03:46:17 PM

 I would call Santhuff about the spring rate &they will make what you need...

Title: Re: front coil springs for L-89 with alum heads
Post by: crossfire on August 18, 2014, 12:21:22 AM

Does anyone know the specs on  gm p/n 3932772.   and would this be the correct spring for the L-89 w/ alum heads.

Title: Re: front coil springs for L-89 with alum heads
Post by: 69Z28-RS on August 18, 2014, 02:44:53 AM

As jano stated earlier, a big block with aluminum heads weighs very close to the same as an iron head small block of the same era, but this is not enough to choose the proper coil springs.   In the 'service manual' (I think?) is a table that shows that the actual spring depends on many variables, that includes not only the engine used, but also other options which add (or reduce) weight of the car on the front end.   Check that table...  Use the Z28 column, and add/subtract as the table says for the options your car has..  that should get you close... to the correct spring as would have been used by the factory.

The spring rate charts are also provided via CRG:   

 http://www.camaros.org/suspen.shtml#spring

Title: Re: front coil springs for L-89 with alum heads
Post by: janobyte on August 18, 2014, 11:09:46 AM

Eaton Detroit Spring Co.

Camaro Specialties

Title: Re: front coil springs for L-89 with alum heads
Post by: 69Z28-RS on August 18, 2014, 04:14:40 PM

.. and Coil Spring Specialties is a company that will wind springs to your specifications that some of us have used...  :)

http://www.coilsprings.com/

Title: Re: front coil springs for L-89 with alum heads
Post by: janobyte on August 19, 2014, 01:32:36 AM

yea well, Qa-1 have carried me 138 under 10.3 in a 89" wb car ,but different website ;) Company out of PA. winds a good spring too ,but the ones I've listed seems to be status quo for this site. Not even getting into dynamics between different rates rears vs. front and disturbances in deceleration..eg.. rear wheel hop. Basically stock BB aluminum headed Camaro should be no big deal.