Quote:
Originally Posted by Oldskool153
spoke to Jay at Jay Fischer Pontiac (from what i kno he's the best aroun with lt1 and ls1 fbodies, but again im a c4 corvette guy not really an fbody guy) anyway he told me that if you look at the door sticker on your car and it came with w raited tires the speed governer is set at 110 from the factory due to FED law, if your door sticker says your car came with zr raited tires the governer is set at 142 from the factory..also the w raited cars have a 273 rear as oppossed to the 3 something rear in the zr raited cars...the 150mph speedo is also an indicator but after 1993 they all recived 150mph speedos..just some food for thought
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I believe he has W rated and S rated confused. W and Y are subsets of ZR.