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  1. 75gmck25

    Fuel leak?

    A couple of years ago I had a fuel pump that was shooting a small squirt of fuel out the side/top through a crack. It was going right onto the exhaust manifold and pipe, and then immediately evaporating from the heat. Constant gas smell, but nothing running onto the ground.
  2. 75gmck25

    Skool me on timing w/o timing tab

    SBC timing tabs may be at the 2 o’clock position, or 12 o’clock (the ones I have seen look more like a vertical tube than a tab), and think there may be one other possibility. To get started: - Pull all the plugs, mark the #1 plug position on the distributor body (white paint, nail polish...
  3. 75gmck25

    Trailer wiring on a 77 K5? How do I do that?

    This diagram shows the difference between the wiring standards. So you need to know what the trailer has. No wonder things get wired wrong. https://www.loveyourrv.com/wp-content/uploads/2022/09/Trailer-Wiring-Diagrams.jpg
  4. 75gmck25

    Trailer wiring on a 77 K5? How do I do that?

    https://www.etrailer.com/Trailer-Wiring/CURT/C57672.html?feed=npn You need to use the Curt adapter in post #4 above to connect the wiring for a 4 pin adapter, which should have these colors. White - ground (will be grounded to the truck body) Yellow - left turn/brake Green - right turn/brake...
  5. 75gmck25

    3 minute battery life…?

    Considering the symptoms, it might be a short to ground. Are you sure you have the polarity right on the battery cables?
  6. 75gmck25

    Can this be removed?

    A factory stock air cleaner has a place on the snout to connect that tube, and the connection has a vacuum and thermal controlled flapper. When the engine is cold, the vacuum flapper opens up the connection to that tube and you get heated air into the carburetor. Engine runs better and there...
  7. 75gmck25

    73-74 grille on a '77

    It should only require the grill supports from the older truck, although I’m not sure how it changes if you have an inside hood release. Older trucks need s notch in the grill for the external hood release.
  8. 75gmck25

    Good rear gears

    Stock tires on a C2500 are probably about 30-31” (245/75R16?), and you don’t have overdrive. Figure out your current rear end ratio and then run one of the many online calculators to figure out what ratio seems to work best for you. My K25 has 4.10 gears and about 30.5” tires, and it runs...
  9. 75gmck25

    Hello, my name is Derek, and I have Just joined this page, trying to find some good information on working on my new 1978 k30

    Most of these use a windshield antenna. There is a snap/button connector on the lower windshield just behind the radio speaker. That button connector has a really short cable attached, with an RCA connector, and then there is a longer cable plugged in and if runs down to connect to the radio...
  10. 75gmck25

    Instrument cluster questions on new build

    Right, the oil pressure gauge reading is also based on sender resistance. However, I've never seen anyone who struggled to match the oil pressure gauge sender like you have to do for the temp sensor. Based on RockAuto listings, the key features to check for are gauge vs. light sending unit...
  11. 75gmck25

    LED conversion

    I’ve seen other cars where the markers alternate like the squares, so there may be a bulb design that works. However, if the old style 1157 bulb keeps it working, it’s probably the best simple solution. I wonder how the full replacement LED park light housings keep it working correctly...
  12. 75gmck25

    Do I even need a gas tank vent tube?

    Blazer and Suburban tanks will fit if you have no spare tire. Not sure the big 40 gallon Suburban tank will work, but smaller tanks definitely fit.
  13. 75gmck25

    Instrument cluster questions on new build

    Oil pressure sensor should be the same for all the engines. Pressure is pressure. Temp sensor might be different, but I think they are the same resistance for each year, regardless of engine. However, SBC 350 usually has a 1/2” thread, and some older SBC’s used 3/8”; not sure about 6 cylinder.
  14. 75gmck25

    Weird solenoid looking thing

    Some vapor canisters are much simpler than the one in the picture. My ‘75 has one hose to the gas tank vent and one hose that used to go to a dedicated vapor port on the Quadrajet. The carburetor port apparently only vented under certain throttle conditions. I now have mine vented to...
  15. 75gmck25

    Dash Pad Help

    This is the new dash pad (Dashes Direct from Jegs) and the new seat foam and cover from LMC. Didn’t buy the dash pad from LMC because theirs was the light saddle color and I wanted the original dark brown color.
  16. 75gmck25

    TH350 issues

    Vacuum modulators come with different color stripes. IIRC, green seems to be the most common, and red stripe has an adjustment screw to adjust shift points. Not sure about the black stripe or those with both red and black. Do a little research before your purchase.
  17. 75gmck25

    Bench seatback foam from LMC - anyone else installed it?

    I got the seat back and cushion foam installed, along with new original design set cover. I apologize for the long answer. :) Seat back - original foam has two metal rods embedded in the back side, running across the foam. Hog rings were used to attach the seat frame to the rods in the foam...
  18. 75gmck25

    Under Dash Wiring Mystery

    GM used the orange wiring for circuits with constant power, like the interior lights, cigarette lighter, etc. If there is a white wire near the orange, it would be connected to something that activates a device by grounding it. For example, interior lights are on constant power from the...
  19. 75gmck25

    Electric fuel pump

    Lots of good suggestions, and I agree that it’s probably not vapor lock. If there is a return line, you have a 6 port tank solenoid. For now I would just bypass it and connect up the fuel line, return and vent for only one tank, and then continue troubleshooting. You said you have no choke...
  20. 75gmck25

    Avs2 problems

    As already mentioned, check carefully for vacuum leaks and/or hoses off. Make sure the throttle moves smoothly and the linkage does not rub or catch on anything. Put the air cleaner back on, and check again for any binding. A stock air cleaner may not seat correctly on an Edelbrock because...
  21. 75gmck25

    OEM cylinder head castings - 1977 K10

    Quite a few original 350's were replaced by Goodwrench 350's, usually purchased from the local dealer. The Goodwrench engines were relatively cheap, and even came with a GM warranty if they were replacing an existing squarebody with an SBC 305 or 350.
  22. 75gmck25

    Avs2 problems

    What part do you have to adjust?
  23. 75gmck25

    82 c10 305 all sensors and locations.

    You can get it running with just the two sensors. You can leave the ESC in place and it will probably work fine, but swapping to a standard HEI would also be a simple change. You can look for one in the junkyard, or there are many aftermarket large cap HEI’s available. Also take a look at your...
  24. 75gmck25

    No power at all, zero lights, guage lights, or anything else. Any help wld be great.

    On the OEM starter there is a large lug where the positive battery cable is connected. - On that same lug there is also a red wire (at least 10 gauge ) with a fusible link. This wire runs up behind the engine, through a protective metal tube, and then over to the power junction next to the...
  25. 75gmck25

    AFR gauge installation

    Is it a wideband gauge, and does it have a heated sensor? No heated sensor - usually needs to be within a few inches of the collector, or in the collector fitting. This because it needs the exhaust heat to read properly. Heated sensor - anywhere between the collector and the muffler or...

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