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  1. M

    TBI tune after installing headers and dual exhaust

    Everything above is correct. Just know that with headers there is no way your stock O2 sensor will ever reach the proper temperature, it needs the mass of the cast iron. The thin tubes can't hold the heat. https://harristuning.com/Tbi/ has a lot of great information about changing to a heated O2...
  2. M

    454 injectors to 350 tbi ?

    454 injectors can work, but they make it difficult in the low RPM and especially at idle. Harris Performance tbichips.com has excellent information on throttle body modifications, troubleshooting, tuning and part selection for TBI motors. I recommend you read his recommendations page and his...
  3. M

    Tbi runs strange

    You may not need to if the Part numbers are the same. It could be a late '87 ECM, after the change.
  4. M

    Tbi runs strange

    If you use an ‘87 ECM in make sure you use the ‘87 knock sensor. They changed it fo’89 and up.
  5. M

    hillbilly dual tank

    I have an '87 3/4 ton. When I bought my truck both tanks were rusted through. I replaced the driver side tank and set it up as a single tank truck, eliminating the solenoid and extra wiring. Later, I got a second tank and put it on the drivers side. I bought a cheap external pump from the parts...

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