1989 IROC - Modifications List

I special ordered this car and took delivery in June of '89. I had read about the new dual cat option in Car Craft and just had to have one!! Following are some of the key options on this car: stripe delete, G92 Performance Axle, G80 posi, J65 4-whl disc brakes, KC4 oil cooler, N96 16" alum wheels, 245-50ZR-16 tires, PEG 3 (fully loaded), LB9 5.0L TPI engine, MM5 5-spd BW T-5 trans. In 1989 a total of 1426 cars were built with the G92 option, including the 111 1LE cars. This is only 7% of the IROC coupes built in 1989, so it's quite rare. The G92 was the basis for the 1LE showroom stock racing car that added bigger front disc brakes and a few other race inspired options to the IROC. I always reffered to my car as a 1LE with AC. Since it is a rare car I have all of the required parts to put it back to stock including the dual cat exhaust and the "Aussie" Borg Warner 9-bolt 3.45 geared rear end.

Engine

355 c.i.

4-bolt main, 2-pc rear main seal, '80-'85 block

GM Cast crank, GM cast rods prepped, Miloden rod bolts

TRW Forged Flat-Top pistons, 9.8:1 CR

AFR 190 Aluminum heads - mild port

Cloyes True-Roller timing chain

Comp Cams custom grind solid roller cam

- 224int / 232exh duration (@.050"), .560"i / .560"e lift, 112LSA

Comp Cams roller lifters, rev kit, and valve springs

Comp Cams 1.6 ratio Magnum roller rockers and Magnum pushrods

Edelbrock TPI manifold base - ported

LPE SuperRam EFI intake - ported

58mm (1000cfm) LPE Throttle body

30# SVO Injectors

Performance Distributors cap, rotor and HEI module, MSD coil

Mac headers and Y-pipe

SLP cat-back exhaust

stock GM catalytic converter and all emmisions controls functioning

Fastrack / Accell DFI computer

Drivetrain

Tremec TKO 5-speed

Lakewood SFI approved bellhousing

Centerforce Dual Friction Clutch

Custom 3" Aluminum Driveshaft

Currie 9" Ford 31-spline rear w/ 3.50 Auburn Pro diff

Suspension

Koni Yellow Sport competition shocks

Eibach Pro-kit springs

HPM panhard bar

Stock IROC 34mm front and 24mm rear sway bars

ES poly sway bar bushings

Hotchkis strut tower brace

GW Subframe connectors, to be installed soon

stock 4-wheel disc brakes, Raybestos pads - street, Porterfield pads - track

16x9.5" lightweight ACT wheels with 265-45-16 Kumho V700 tires

Interior

All factory GM