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  1. 75gmck25

    Smog thoughts

    By ‘86 there were quite a few emissions controls, including the possibility of electric controls on the Quadrajet and maybe ESc spark control. It will not be simple.
  2. 75gmck25

    1976 C20 Burb: 3/4 ton fuel system and EVAP

    My truck has 8400 lb GVW, and therefore for 1975 it did not have catalytic converters. I am not sure what other controls were standard, but it’s a lot simpler than the lower GVW trucks. When I run the numbers on my original Quadrajet the book shows it as a California version. I don’t think...
  3. 75gmck25

    1976 C20 Burb: 3/4 ton fuel system and EVAP

    My ‘75 3/4 ton has HD emissions, and it includes a charcoal canister. The telltale sign is that there are three metal lines running from the gas tank switching valve up to the engine compartment. Two lines end on the frame rail right next to the fuel pump (supply and return), and the third...
  4. 75gmck25

    Loud Knock After Replacing Intake Manifold

    Use a mechanics stethoscope or a piece of tubing and listen at the valve cover over each cylinder. I used that method to find out an adjuster had loosened on one cylinder and I was hearing the pushrod clattering.
  5. 75gmck25

    350 water pump studs

    IIRC, the original studs are fine thread on one end and coarse thread on the other end, and a short unthreaded section in the middle. Similar to these. https://www.amazon.com/dp/B000CO779G/
  6. 75gmck25

    Hyd roller with stock timing cover

    I used a retrofit roller in my SBC, but also added a Cloyes two piece timing cover with an adjustable button. Stock steel timing covers apparently are not stiff enough to keep the cam button from moving out and allowing play. Stock one piece timing cover is also a PIA to get off on an SBC...
  7. 75gmck25

    factory temp gauge wire color

    I have the factory gauge, but a ‘75 OEM gauge has no degree markings, just lines, and the original GM ‘75 sending units are no longer stocked. My current sending unit is the closest match I could get to the original. I added a mechanical gauge so I could cross-check and get the actual...
  8. 75gmck25

    This makes 0 sense to me! Heater hose route

    That setup in the last picture is how my ‘75 350 with TH350 is plumbed. Mine also has HD cooling (standard when you order A/C), so it uses a longer PS belt that goes around the both the crankshaft and water pump (dual groove pulley on water pump). If the alternator belt breaks, the PS belt...
  9. 75gmck25

    What motor is best for a swap on a K25

    Your first step is to determine a rough idea of your budget and time schedule, and then review your mechanical skills and tools. 2nd step is to describe how you plan to use the truck (daily drive, load hauler, off-road fun, etc.). Then post the answers here and you will get better input.
  10. 75gmck25

    Quadrajet Choke and Fast Idle Linkages

    I also have a1708213 Quadrajet. Here is a picture of the pull-off and choke linkage.
  11. 75gmck25

    Transfer case

    From what I recall the CUCV’s came in different GVW/load ratings, so they may have used different transfer cases for the HD trucks. The M1008 (Blazer) definitely had higher gears and you could really tell the difference on the highway. Most of the pickups we used had 4:56 gears because they...
  12. 75gmck25

    2003 Acura MDX

    Buying an older used vehicle at a good price is often based on the last repair estimate the owner got. They bring the car into a dealer or big repair shop and are told it will cost $4000 to fix it properly, and the car is worth about $3-4 tops. When you look at the repair estimate it is for...
  13. 75gmck25

    steering box bolts

    Doesn’t the back side of the box have a small indent where the bolt goes through, and the spacer fills the indent and gives you a smooth, level surface to bolt onto the frame?
  14. 75gmck25

    What is my new squarebody??? Need help!

    When GM had the contract for CUCV tactile vehicles it was also comon to see GM trucks used for non-tactical work on posts and bases. Basically vehicles for local support activities. However, I always assumed they were standard GM vehicles that were purchased at a discount because of the big...
  15. 75gmck25

    Frame mounted Trailer Hitch for Step bumper

    It’s been a while since I searched for one, but vendors used to sell frame hitches that were specifically designed to work with a step bumper.
  16. 75gmck25

    Chevy Replacement Grill with 350 emblem option

    75 also had it. Not sure when it stopped.
  17. 75gmck25

    Quality replacement steering box

    I checked the Detroit Speed web site and all steering boxes listed were for 2WD.
  18. 75gmck25

    Quality replacement steering box

    I had forgotten about the Borgeson steering gear. Expensive. but at least it’s new. One concern I have is that they show the applicable parts number to be for a K10, and I have a K25. I always thought the steering gear was the same for both 1/2 ton and 3/4 ton 4WD. The Red Head is a rebuilt...
  19. 75gmck25

    Quality replacement steering box

    I’ve gone through rest of my 1975 K25 front end, and now it’s time to get some of the play out of the steering box. There seems to be multiple alternatives, and I want to get it right the first time. - buy a kit and rebuild mine (about $40 for the kit). However, I don’t have any knowledge...
  20. 75gmck25

    Double cardan ball

    Could the assembly possibly be pressed in, like a ball joint?
  21. 75gmck25

    Single din install problem

    Cutting the old dash to install a DIN style radio was popular when folks wanted to have space for a CD or MP3 disc player. Now most drivers use Bluetooth, USB memory stick, XM radio or other ways to access a large number of songs. Your dash is less molested than most, so I would just use a two...
  22. 75gmck25

    Interior light mystery

    To add to Fast 99’s explanation, the dome light circuit works differently than other circuits in the truck. It has constant power, and the ground is switched. - Orange wire always has power for the dome lights, truck bed light, etc. - white wire is the ground for the circuit. The door...
  23. 75gmck25

    Factory charge wire gauge

    Question for CalSgt - are those exhaust manifolds just stock and very clean, or are they aftermarket?
  24. 75gmck25

    Double cardan ball

    I replaced that part in the front driveshaft of my ‘75, and don’t remember it being very hard. I’ll have to take a look at the manual again to see how it came apart. However, mine had completely self destructed, so maybe that made it easier. It appears that the ball assembly was bolted on my...
  25. 75gmck25

    Factory charge wire gauge

    I just left the stock charge wire in place, and added an 8 gauge wire (with 12 gauge fusible link) running directly from the battery positive to the Bat terminal on the alternator.

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