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1978

  1. IA II Engine Build Design Guidance

    Engine
    Hello All, I am currently in the process of planning an engine build for a 1978 Pontiac Trans Am. This build will be for a street/strip application. The focus is on low-end RPM torque (as it should be :D). Trying to get all of the numbers to agree with each other so the engine doesn't self...
  2. Hello All.

    Introduce Yourself
    I'm relatively new to hotrodding. Roughly a year ago, I purchased a 1978 Pontiac Trans Am to restore/improve and have finally come to the point where I can't find much else via researching old threads and articles. Looking forward to hearing advice from the more experienced members on the forums...
  3. 78 GMC tailgate in an 85(?) box?

    Body - Exterior
    I have a box off of what I think is an '85 chevy truck that I'm using as a replacement on my 1978 GMC. Will the tailgate from my '78 fit in the new box? I've heard there are differences but will these affect it. I will be using the latches and hinges from the '78. Thanks in advance for any advice.
  4. Tachometer trouble

    Hotrodding Basics
    The tachometer I put on my 1978 GMC truck is acting up. When the truck is idling, the tach will be pegged out, then when I rev the truck up, it will drop down to zero RPM on the tach, then at highway speed (around 60 MPH), it will say somewhere around double the RPM it should be running. Tach...
  5. 1990 Chevy 350 aftermarket parts.

    Engine
    I found a 1990 Chevy 350 for my 1978 chevy truck and I was wondering what parts are interchangeable between the 1978 engine and the 1990 (pistons, crank, con. rods, cam. Stuff like that).
  6. 1978 C10 Custom Quad Exhaust

    General Rodding Tech
    Yes, you read me right. I said "quad exhaust." No, I'm not crazy. I'm just....... Not normal. **slaps knee and laughs** anyways I have a '78 C10 now (I sold the Camaro) and want to put in an exhaust, just don't know how to do it..... Basically I want 4 exits. Two in front of the rear wheels, and...
  7. T-350 wont shift to 3rd

    Transmission - Rearend
    I have just replaced a th350 in my first car. It is a 1978 Chevy Cheyenne with a L6 250........ So the transmission has less than 200 miles on it and it wont shift to third when the truck is warm. It does it fine when the truck is cold. Also it makes a whistling noise when it shifts to 2nd and...
  8. New Guy Here

    Introduce Yourself
    Hey everyone. I just registered here because i was having huge issues with timing my 78 350 sbc swapped into my 79 scottsdale 3/4 ton (original 400 6.6l). I googled for answers and kept coming up with this forum. I used alot of the advice i found on this forum to finally get my truck purring...
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