NSW Corvettes

Technical Tips => Pre 84 => Topic started by: 73 CORV on November 24, 2015, 11:20:03 AM

Title: lowering kit
Post by: 73 CORV on November 24, 2015, 11:20:03 AM

:Can anyone advise me where I might be able to pick up a lowering kit eg;lowering bolts for a 73 coupe in Australia. Cheers

Title: Re: lowering kit
Post by: Vettech on November 24, 2015, 12:58:05 PM

You might try Ian at ChevParts Yenora, or Pontiworld down Albion Park way. I know I bought bolts from Chevparts many moons ago, but these were normal length, which still have some adjustment. Plus new rubbers/bushes etc.

Title: Re: lowering kit
Post by: 73 CORV on November 24, 2015, 03:41:32 PM

Thanks champ I'll give them a try tomorrow.

Title: Re: lowering kit
Post by: bfit on November 24, 2015, 03:44:19 PM

standard bolts are 8" long.
you can buy  grade 8 bolts at any good industrial bolt suppliers.
Make sure you ask for grade 8 do not accept grade 5.
you will need UNF thread and nilox nuts ( I like grip nuts they are more reliable and you can buy them hardened. )
 
  grade 8 will have six makes on the head of the bolt

https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx (https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx)
 this will help
how far do you want to lower the car.
Bfit

Title: Re: lowering kit
Post by: Vettech on November 24, 2015, 04:40:04 PM

Oh, the reason I changed the bolts was that whilst doing something else I noticed the "originals " were rusted and bably collared, plus the rubbers had turned into concrete, I would imagine its a good idea to replace these at reasonable intervals. And yes Bob is correct they must have the five marks for grade 8.

Title: Re: lowering kit
Post by: 73 CORV on November 24, 2015, 06:13:23 PM

Thanks guys, need to drop it another  1" at least, at the moment I have 8" bolts.

Title: Re: lowering kit
Post by: bfit on November 24, 2015, 07:05:29 PM

Have you got castellated nuts  on the bolts at the moment
What the measurement from ground to chassis just in front of the rear wheels
Bfit

Title: Re: lowering kit
Post by: 73 CORV on November 24, 2015, 07:26:43 PM

150 off the ground I have nylon nuts

Title: Re: lowering kit
Post by: bfit on November 24, 2015, 07:32:04 PM

The nuts must be close To being as far down the bolt as possible,
The standard measurement would be 7 and 5/8"  ( about 194 mm ) to 8" ( 200mm)
Which means the car is already lowered around 1.5"
Bfit

Check these pages.
http://tech.corvettecentral.com/2011/04/c2-c3-corvette-ride-height-guide/ (http://tech.corvettecentral.com/2011/04/c2-c3-corvette-ride-height-guide/)

This shows where to measure chassis

http://www.c3vr.com/member_pages/4401_4500/4427/specs.jpg (http://www.c3vr.com/member_pages/4401_4500/4427/specs.jpg)

Title: Re: lowering kit
Post by: 73 CORV on November 24, 2015, 07:37:55 PM

The nuts are all the way down as far as they can possibly go. I'm trying to load a photo of the car but haven't been able to.

Title: Re: lowering kit
Post by: 73 CORV on November 24, 2015, 07:54:49 PM

Cheers for the links mate I'll have to check my wheel sizes to.

Title: Re: lowering kit
Post by: 73 CORV on November 28, 2015, 08:33:47 PM

installed 5/8 bolts 9'' long that was the longest bolts I could get it was enough for what I wanted Great result Tried to post pictures but wasen't able to