75gmck25's latest activity

  • 75gmck25
    75gmck25 replied to the thread Help cant get heater box out.
    It’s been a long time since I replaced mine, but I don’t think the AC box had to come out. However there is one stud hidden by the...
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  • 75gmck25
    75gmck25 replied to the thread Where does this go???.
    Cigarette lighter wiring should be orange, since it provides constant power to the plug.
  • 75gmck25
    They used to sell them at the auto parts store in the same place they had gauges, but it's been a long time since I've seen that...
  • 75gmck25
    I replaced the string on mine with nylon fishing line that is tied to the metal retainer. It’s worked fine for years.
  • 75gmck25
    75gmck25 replied to the thread Engine Paint Color Question.
    My original ‘75 engine was probably orange, but I’ve never really liked that color. However, sometimes its because I see a picture...
  • 75gmck25
    Some general guidance- start out with better heads and higher compression. - Original smog heads are very poor flow. Better flowing...
  • 75gmck25
    75gmck25 replied to the thread HVAC Vacuum setup.
    The small diameter vacuum line is sold in two sizes, and it’s often referred to as GM hard vacuum line. Parts stores used to stock it...
  • 75gmck25
    75gmck25 replied to the thread HVAC Vacuum Controls.
    Sounds like they integrated the functions of the vacuum reservoir more in the later years. For my ‘75, I think that was the first year...
  • 75gmck25
    75gmck25 replied to the thread Carb Swap?.
    The Edelbrock AVS2 is an improved design over the old 1406, and it is supposed to have better performance parameters. Annular boosters...
  • 75gmck25
    75gmck25 replied to the thread HVAC Vacuum Controls.
    The reservoir on the drivers side is usually for the cruise control. The HVAC reservoir is on the passenger side, very close to the...
  • 75gmck25
    75gmck25 replied to the thread Wire terminal ID.
    See if you can match it to one that these guys sell...
  • 75gmck25
    75gmck25 replied to the thread Nasty gas tank.
    On Roadkill TV show they always put at least two of the large diameter metal-body fuel filters inline before the fuel pump when they...
  • 75gmck25
    75gmck25 replied to the thread 1981 C30 cluster issue.
    Did you make sure you connected the cluster ground? It’s usually a black wire connected to a post on the emergency brake mechanism, or...
  • 75gmck25
    75gmck25 replied to the thread 74 C20 Ammeter.
    The stock ammeter uses the resistance of the wiring harness as a shunt. There are two fuses under the hood where it connects to the...
  • 75gmck25
    75gmck25 replied to the thread Rear end.
    It is possible that your truck has 4.56 gears, since it’s a one ton. Changing from 16” to 17” rims is not the key measurement. You...

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