heard the TRW sags after a while, have to use longer bolts for ride correct ride height, but not with the vette brake products. Am I correct?

 

All good information. No doubt this will be a continuing evolution.

 

Does anyone know if there is a dimensional difference in 330/360 springs?
I have had a composite spring on my ‘69 for over than 30 years & I don’t remember which I have.

 

I don't believe there is any visible difference.....

So much for those that say the composites are not as durable as the steel spring...my VBP 360 I put on the car in 1986....................

 

I had a TRW years ago and the car sat impossibly high , got rid of that and have used VB&P springs since , but you still need longer bolts to get the car down to a normal ride height, they sell the bolts as well , as a mounting kit .

 

Stock spring bolts on my VBP 360 spring:

 

I couldn't get mine to do that ! but I'm happy with what I got

 

FWIW , here's a 420lb a 360lb and a 330lb . The 420 brand new , the 360 has 2500miles on it and the 330lb(tallest) has 8 years of driving.

 

Thanks for posting bazza77

Is that header wrap on one of the rear springs, if so is there an exhaust heat issue for these springs?

 

The first one I bought came with a heat shield , but my pipes are a little wider apart than an original set-up so I put the insulation "just in case"

 

Is the insulation just some exhaust pipe wrap or did you use something else.

 

From memory I think it was steam pipe lagging .It is mainly fibreglass as It makes you itchy when you handle it .

And no its not old enough to have asbestos in it .

 

Wouldn't matter. I am old enough

 

Yes, if the exhaust is too close, it can damage the spring. Remember this is just some fiberglass and resin. The resin will breakdown with heat. I have side pipes so there is no issue on my cars.

When my dad ordered the spring on my, then his, 73, he called up VBP and asked for the highest rated spring they had on the shelf. It came out to like a 432 spring. According to VBP, they don't make a spring to a certain rating as it is impossible to do so. They make the spring and then test it to put it into a certain range. So when you order a 360lb spring, it could really be at 350 or 370. I don't know where VBP sets the +\- is for the different ratings though.

My setups that I autocross with (do very little street driving):
Both 73 and 76:
550 front springs
1-1/8 front bar
3/4 rear bar
KYB gas a just shocks

73 has a 420+ rear spring and M21 4speed and 3.36 gears
76 has 360 rear spring and TH350 auto and 3.08 gears.

I will consistently be in the top of the time brackets and have taken several overall FTDs on short, tight courses where horsepower doesn't come into play.

Both cars handle very well. The 73 is a tad quicker only because of the gears and 4speed. My eventual plan is to build another motor for the 73 (since the old one wiped a cam) and install 3.55 gears. I will move the 3.36 gears to the 76.

 

 

Yeah I know what you mean about the testing and actual values, we emailed VBP a few years ago asking about a spring for my mates 74 ,he runs a 200 litre fuel tank and had snapped his steel spring, they said and recommended one there that tested at 390lb so he got that one sent over and its done a good job , he runs side pipes so no problem with heat .