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Author Topic: front coil springs for L-89 with alum heads  (Read 467 times)
crossfire
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« on: August 15, 2014, 09:47:30 PM »

What were the coil spring  specs for a 68  with L-89 / alum heads, heater delete, manual steering  4 speed
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janobyte
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1968 z/28

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« Reply #1 on: August 15, 2014, 10:36:05 PM »

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.
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ban617
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« Reply #2 on: August 17, 2014, 10:46:17 AM »

 I would call Santhuff about the spring rate &they will make what you need...
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crossfire
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« Reply #3 on: August 17, 2014, 07:21:22 PM »

Does anyone know the specs on  gm p/n 3932772.   and would this be the correct spring for the L-89 w/ alum heads.
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69Z28-RS
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« Reply #4 on: August 17, 2014, 09:44:53 PM »

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

« Last Edit: August 17, 2014, 10:12:42 PM by 69Z28-RS » Logged

Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
janobyte
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« Reply #5 on: August 18, 2014, 06:09:46 AM »

Eaton Detroit Spring Co.

Camaro Specialties

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69Z28-RS
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« Reply #6 on: August 18, 2014, 11:14:40 AM »

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

http://www.coilsprings.com/
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
janobyte
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1968 z/28

bajcer@msn.com
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« Reply #7 on: August 18, 2014, 08:32:36 PM »

yea well, Qa-1 have carried me 138 under 10.3 in a 89" wb car ,but different website Wink 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.
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