Ok guys, I recently acquired an junked out 87 IROC for parts. I am going to put the suspension under my 89 RS, and I have a few Q's about some of the parts. The IROC has the wonder bar, and the 36mm hollow front sway bar which I will definetly use and I will use the rear sway bar. I will also install polyurethane end link bushings and tubular lower control arms and panhard rod. The car already has KYB shocks and a polyurethane transmission mount and torque arm bushing. My question is about the springs, I recently put 17" wheels on the car and I want the best handling set-up I can get from used factory parts, I will upgrade to aftermarket later. The IROC has 6ZW, LH - FR and 7ZW, RH - FR and 8NL, LH - R and 9NL, RH - R springs. Are these desirable springs for handling or are there better factory ones?? I ask because I know where a few more IROCs and one WS6 Formula is at that I could get springs from if I needed. Thanx in advance.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91 @92.9
Bassett Racing
Mid Atlantic F Body -82 Z28 Page

R.I.P. Dale Earnhardt #3

 

The 6ZW&7ZW springs are going to be about the highest sping rate springs that you are going to find. The last 2 characters are the rate(ZW),I do not know what the first chacacter means. But "XX" is the lightest, and "ZZ" is the heaviest. The top 4 springs "ZW,ZX,ZY,ZZ" are all replaced by a single GM part# 14029399.
So the IROC spring installation would be a good move.In my opinion.
The rear springs are kinda the same way "UZ" being the lightest,and "NB" being the heaviest. NNM & NNB are only used on the FE2 & F41 suspensions.
So again, that would be a pretty good move.

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82Z 305 w/comp 270 magnum cam,holly.TH700R4 w/B&M holeshot 2000 converter,& megashifter.1LE front brakes, 9bolt 3.27 w/1LE rear brakes.Aluminum driveshaft,boxed rear susp.,IROC swaybar+wonderbar. 70mph@2200rpm ASE Master Tech plus L2
also recently obtained a
'69 chevelle SS396 w/Turbo 400,3.31 posi,11.0 to 1, headers,etc. Latest project car,'86 IROC stock 305TPI hit on left side,but not too bad

 

By the way! I am installing '86 IROC front springs in my '82Z28, and I noticed that the IROC "BZX" front springs are 3" shorter than the stock '82 springs. Just thought I would mention it.
Thanx,ANDYZ28

[This message has been edited by ANDYZ28 (edited March 14, 2001).]

 

Basset Racing,

Are you positive that the 87 IROC has a 36 mm front stablizer bar? I ask because I've been led to believe that that particular bar came in only 89-92 Camaros (and 86-92 Firebirds).

JamesC

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