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Old Jun 25, 2023 | 12:08 PM
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Default Rear Composite Spring

Anyone done a composite rear spring upgrade? Is it worth the $500 for the spring?

Since I’ve [size=13px]retired,[/size] I’m planning a series of overnight “back road only" trips and looking to enhance the ride quality.

Yes, I understand it’s a sports car and [size=13px]won't[/size] ever ride like a caddy.
[size=13px]I'm[/size] being recommended a #330 low arch composite spring.

I have already replaced the shocks.
My car is a 71 C3, 350 CI, 270 HP, 4 speed manual, convertible.

[size=13px]Thanks much[/size] for [size=13px]impute[/size]! Is it worth the money?
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Old Jun 25, 2023 | 12:25 PM
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money=value=want.
480lb rear comp has good reviews.
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Old Jun 25, 2023 | 02:37 PM
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I run a dual mount VBP ? out of business now, Van Steel has taken over this product & replacement parts for it.
I don't remember the spring rate but as far as running back country roads or freeways it's nice and smooth, Bilistein shocks now
get into crappy bumpy pot hole roads it get like an old covered wagon ride
I also run a 71, convertible, Doug Nash 4+1, 3:08 rear = definitely the verts have much more flex
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Old Jun 25, 2023 | 05:56 PM
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What shocks did you replace with? I heard you need pretty stiff for composite spring
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Old Jun 25, 2023 | 07:15 PM
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QA1 non adjustable.
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Old Jun 25, 2023 | 08:08 PM
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Im not sure if those will be stiff enough but others can comment.
have you considered gymkhana steel new?
https://www.corvetteforum.com/forums...-spring-3.html
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Old Jun 26, 2023 | 06:15 AM
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No sir I haven't considered that product. The OEM springs are perfectly fine and I'm mostly looking for feedback from others that have upgraded their springs and was it worth it.
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Old Jun 26, 2023 | 06:42 AM
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I have qa1 non adjustable too
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Old Jun 26, 2023 | 06:44 AM
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Do you like them? I just put mine in, they were expensive but recommended as the best.
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Old Jun 26, 2023 | 07:20 AM
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I like them alot. Ride nice but do the job.
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Old Jun 26, 2023 | 07:45 AM
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I put in a composite mono spring back in the 90's. A VB&P 330.
And frankly I'm surprised that a whole lot of people haven't chimed in by now, I guess timing is everything.
Bottom line. The glass mono spring is way worth the money! Hands down a HUGE improvement over the shitty steel multi leaf springs.
Ask yourself. Did GM stick with the steel multi leaf spring? Look at the C4. Or even the last of the C3's.
You do need the correct shocks to match.
Bilstien B8's on mine.
You couldn't pay me to put the factory gymkhana rear spring back on mine.
Handles better and rides better.
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Old Jun 26, 2023 | 07:51 AM
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Another benefit of a composite spring is you are taking 25-30lbs of weight out of your car.

Pat
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Old Jun 26, 2023 | 08:27 AM
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I have the 360 spring works well.
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Old Jun 26, 2023 | 09:59 AM
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Originally Posted by 7t9l82
I have the 360 spring works well.
good info for OP! same shocks and it works.. didnt want to have to change shocks again if needed for plastic.
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Old Jun 26, 2023 | 10:31 AM
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I have the Van Steel 360lb spring and QA1 single adjustable shocks. The ride is less harsh than the steel spring and the handling is better. If I had to do it over again I would go with the 330 lb spring and add a small rear sway bar.


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Old Jun 26, 2023 | 11:39 AM
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I have the VBP 330lb Monoleaf and Bilstein Sport shocks which is great for running the back roads, however, the ride is firm so you can feel the quality of the roads.
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Old Jun 26, 2023 | 11:58 AM
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I have a VB&p composite spring thats either a 330 or 360 (not sure as I purchased used with no discernible markings). I installed it a few months ago along with a pair of viking dual adjustable shocks. I have yet to get the new front end components installed but the ride quality has noticeably improved. I have my shocks set for stiffer performance though.
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Old Jun 26, 2023 | 12:07 PM
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Old Jun 26, 2023 | 08:19 PM
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Originally Posted by 4-vettes
I put in a composite mono spring back in the 90's. A VB&P 330.
And frankly I'm surprised that a whole lot of people haven't chimed in by now, I guess timing is everything.
Bottom line. The glass mono spring is way worth the money! Hands down a HUGE improvement over the shitty steel multi leaf springs.
Ask yourself. Did GM stick with the steel multi leaf spring? Look at the C4. Or even the last of the C3's.
You do need the correct shocks to match.
Bilstien B8's on mine.
You couldn't pay me to put the factory gymkhana rear spring back on mine.
Handles better and rides better.
What he said. I installed the VB&P composite rear spring back in the '90's. It is one of the best mods I have done. Better handling, smoother ride. No down side.


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Old Jun 27, 2023 | 05:21 PM
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Many thanks for the numerous responses to my composite spring upgrade question!
The overwhelming consensus, that is at least from those who have done the upgrade is it's an excellent product and well worth the money.
I've decided to install the #330 spring. I have already installed QA1 shocks and will do the spring when I reinstall the diff which is currently being rebuilt at Van Steel.
Again, many thanks.
Alan
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