Search results

  1. 75gmck25

    recommend some tough seat covers

    There are new synthetic materials that are as durable as vinyl or leather, but don’t feel like hot plastic. I would think an upholsterer would have a catalog to get them from, if you are getting custom made covers.
  2. 75gmck25

    AC Confusion-Need Help

    The big compressor in the picture is the long, heavy A6, and the smaller pancake compressor is the R4. Both are generally not too reliable. I’ve never seen the compressor mounted on a squarebody on the passenger side. Where is the alternator mounted? Extending the compressor lines should...
  3. 75gmck25

    Defroster not working

    As suggested, check that line under the hood for vacuum as it comes out of the ball, and then find the same line where it comes through under the dash and check it again. It’s probably the thin GM hard vacuum line. I always hate to cut it just for testing, but you can easily splice it again...
  4. 75gmck25

    K20 Wheel/Tire Confirmation

    I also had similar tires and wheels on my ‘75. I found the cheapest solution for wheels was to go to pick and pull and get 8 bolt 16” steel wheels off a 3/ 4 ton GMC or Chevy. I paid $25 each for one I pulled myself. For tires I just looked for the best price on 245/75R16E tires with a decent...
  5. 75gmck25

    Holley sniper cable routing

    Drivers side - If you have dual tanks, there is a grommet for the wiring just to the passenger side of the brake booster. Look up under the dash where it comes through, and pick a good spot nearby to make a new hole for the EFI harness to come through. Passenger side - there should be a...
  6. 75gmck25

    Hiya Folks, new owner, battery, oil, and filter recommendations

    Since you like Mobil 1, they sell classic car oil with the high zinc levels (usually about 1200-1300) you need for a flat tappet cam. I know they have the high zinc in 15w50 and 0W40, and I can usually find it’s in stock at the local stores (even Walmart). There are other brands of high zinc...
  7. 75gmck25

    ac control vacume line source

    I believe all with A/C have the same basic design, although the vacuum ball may be shaped a little different, and I’ve seen one mounted so the vacuum connections go sideways toward the drivers side. All that canister does is provide a reservoir for vacuum, so when you accelerate and engine...
  8. 75gmck25

    ac control vacume line source

    This is the picture of my ‘75. The larger vacuum line coming out of the bottom of the reservoir/ball runs over to a manifold vacuum tree on the intake. You can also see the small vacuum line that runs across the plenum, and through the firewall to the dash controls. Your vacuum ball might be...
  9. 75gmck25

    Blower fan/relay

    If you have A/C there is a blower motor relay mounted on the A/C plenum under the hood. I’m not sure of the setup on a non-A/C truck. On my ‘75 there is also a blower resistor pack/assembly on the plenum. The resistors are used for lower speeds, and high speed is a direct 12 volts.
  10. 75gmck25

    Question about headers

    I’ve alway been interested in whether the old style (straight down outlet) 2 1/2” rams horn manifold can be used on a squarebody without doing a lot of cutting or re-engineering to get them to fit. They have a good reputation for flow, and there are both original and aftermarket versions...
  11. 75gmck25

    Q: AC Vacuum Accumulator

    If you have a vacuum canister on the drivers side near the firewall, I assume it’s probably for cruise control, which I don’t have.
  12. 75gmck25

    Q: AC Vacuum Accumulator

    This is a picture of the vacuum canister on my ‘75. The larger hose coming out of the bottom runs down and over to manifold vacuum. You can see the small line that comes out of the bottom, across the plenum top, and then over and through the firewall. That small line is connected to the HVAC...
  13. 75gmck25

    Alternator cable routing

    Original routing on my ‘75 was with the BAT wire in a plastic loom, clipped to the top of the valve cover, down the back of the engine through the metal tube, and with a fusible link where it connected to the starter lug. There is a 2nd power wire connected to the starter lug, and it runs up...
  14. 75gmck25

    Q: Trick to Reattaching Speedo-Cable

    You also need to push firmly but carefully until the flared end of the cable gets by the spring clip and is held in place. The speedometer might initially work if it’s not fully seated, but it will eventually pop back out, or make the needle bounce later.
  15. 75gmck25

    Automatic hubs

    Try looking at the Milemarker product line. Converting to manual hubs is a common fix when converting an NP203 to part time, so I’m sure the kits are still available.
  16. 75gmck25

    Air cleaner housing missing a connection

    This picture below is the filter and clip. Then you need the valve cover fitting, which is just a short metal connector, and the short hose that prairiedrifter shows in his picture. A visit to pick and pull will get you a valve cover fitting the quickest, since they were used on many GM...
  17. 75gmck25

    Mounting D rings on a 77 K10

    D ring shackles usually include a mounting strap with two holes. Can’t you just bolt it to the bottom of the frame rail behind your bumper? They will be tucked up quite a bit, but very secure.
  18. 75gmck25

    Cylinder head gasket replacement job

    The sending units are either 1/2” or 3/8” threads. The size difference is very easy to see. Most 350’s I’ve seen have the large one, but I’ve seen heads for 307’s that uses the small one. There are no sending units I know of for a stock SBC that use metric threads. The sending unit and gauge...
  19. 75gmck25

    Cylinder head gasket replacement job

    There is only one ground for the entire instrument cluster. If it’s disconnected you will have multiple gauges and indicator lights not working. It’s not an easy fix to add a separate ground to the temp gauge, since you need to remove the cluster first, and I doubt that is the problem anyway...
  20. 75gmck25

    Cylinder head gasket replacement job

    I’m not sure if it’s one of the tools you can borrow from the parts store, but there is a tester that looks for exhaust gas in the antifreeze. If you find exhaust there, that is a sure sign of a blown head gasket.
  21. 75gmck25

    Throttle cable way too long

    I have a similar long cable on my ‘75. It’s what came up as a replacement part from Autozone. I was able to loop it so there was no binding, so I continue to use it.
  22. 75gmck25

    Thermostat not working, no coolant leaking from water pump, no pressure on upper & lower hoses

    There is a black dash cluster ground up under the dash, either grounded to a post on the emergency brake mechanism, or in later trucks to a ground bus screwed to the firewall. If the cluster ground is disconnected it usually screws up both gauges and turn signal indicators. Also remember that...
  23. 75gmck25

    My Goodwrench is on life support. But what is the best course of action?

    In about 2003 I bought a new GM 350/290 hp crate after my 350 threw a rod. I lived in a gated community with restrictions on mechanical work. We pushed/parked the K25 so it was set back several feet in front of one garage door and then pulled off the grill, radiator, hood, and everything else...
  24. 75gmck25

    How to adjust the steering wheel

    Also pop off the center cap on the steering wheel and take a look at the threaded shaft under the nut. It is possible that someone in the past has tried to center the steering wheel by just popping it off and remounting on the shaft. My steering shaft has a very small notch in it under the...
  25. 75gmck25

    Engine swap

    You need to get a little more info on the newer engine. - GM went from a two piece rear main seal to a one piece (less likely to leak) on newer engines. Both will work, but the flywheel has to match. - if it still has stock heads they might not be much better than what you already have. The...

Latest posts

Forum statistics

Threads
44,390
Posts
956,235
Members
36,677
Latest member
brodiebaker
Top