The KV85 8.5mm jacket has a service heat resistance of 600 degrees F (320 degrees C) and up to 1,000 degrees F (540 degrees C) for short burst 3 minutes. Even if limits are exceeded, the silicone rubber will retain its insulating ability until wires are removed from engine.
Magnecor Race Wires are primarily designed and constructed to be used in applications where it is essential to prevent the possibility of ignition wires compromising engine performance. Modern race engines, modified street engines and stock street engines which rely on electronic devices to control the function of either or both the ignition and fuel systems are prone to interference from all other spiral conductor ignition wires sold through performance parts outlets, none of which can provide proper suppression for EMI, particularly if a high-output ignition system is used.
We always recommend use of our Race Wires for any stock or modified late model street engine that is electronically managed, however most other modified or street engines can also use our Race Wires to improve ignition performance
NOTE: For a 1992 Alltrac Celica/GT4, or for a 1991 ST185 GT4 "RC Edition" Celica, you will need the 1993 version plug wires 45253.