88 - 92 IROC-Z 1LE Performance Package

dave8412  Jun 16 2006 - 8:46am   

Q: What's included in the 1LE Performance package?

A: In 1988, the secret showroom stock racing 1LE option (option level 0 IROC-Z)was first available; however, only 4 were produced. Then in 1989, the option became more well-known as 111 were produced that year.

The package was obtained by ordering the following:

  • Level 1 IROC-Z with 5.0 TPI engine with 5 speed or 5.7 TPI engine
  • Optional axle ratio (G92) (305/3.45, 350/3.27) and its required options
  • Air conditioning delete (C41) (standard heater)
    The package originally consisted of:
    • Fog lamp delete
    • Aluminum driveshaft (JG1) (part # 10085375)
    • Performance exhaust system (N10) (dual catalytic converters)
    • Special deflected disc shocks
    • Aluminum spare wheel with smaller spare tire (N64)
    • Lower control arms (part # 10164151)
    • Larger (11.86 inch) front rotors (part # 18016035)
    • Larger front spindles (part #'s 18016737 / 18016738)
    • PBR front, dual-piston aluminum calipers (part #'s 10132827 / 10132828)
    • Special swinging fuel pickup in gas tank and special 18 gallon baffled fuel tank for fuel pickup down to .5 gallon reserve to prevent fuel starvation in hard cornering
    • Some came with special 16" x 8" light alloy mesh wheels (XWL)
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