Thread: Resealing a Brake Proportioning Valve

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My IROC came with a 305 TPI engine, 145 MPH speedo, 16" wheel package and disc/drum brakes from the factory, you could order these cars just about any way you wanted and all these options match the factory RPO Codes on the car. I recently replaced the stock TPI 305 engine with a carburated, fire breathing 383 Stroker, raising the bar from 190 HP and 285 ft lbs of torque to 430 HP and 452 ft lbs of torque; this is how the car should have been built and it gained a lot of character with the swap. Here is a pic of the factory RPO Codes...........

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