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  1. 75gmck25

    78 K-10 Dual Tank Install

    Saw your posts, but I’m not sure if you have a question about the dual tanks or are trying to post an answer. AFAIK, the old 6 port solenoid with only a single electrical terminal is still not available. Switching to the multi-wire 6 port solenoid requires some new wiring, but then you can just...
  2. 75gmck25

    Can I use this hole for filling oil?

    PCV always need an "in" port in one valve cover and an "out" port in the other valve cover. The PCV pulls constant vacuum toward the base of the carburetor and draws air and moisture out of the engine crankcase. The pop-up mechanism inside the PCV valve controls how much air is pulled in...
  3. 75gmck25

    Bare Hands

    I try to use nitrile gloves as much as I can for drivetrain work, but have to use the large HD gloves from Harbor Freight so that they last through some wrenching. The lighter weight nitrile gloves tore too easily, and the smaller sizes are a PIA to get on and off. I use fabric gloves from HD...
  4. 75gmck25

    Two piece front drive shaft

    Based on parts from RockAuto, you need a 23 7/8” drive shaft, and your old one is probably 29 1/2”, measured from center of one u-joint to center of other u-joint. A new one for MT is about $400, so finding a shop to shorten yours is probably a lot cheaper. Also budget for new u-joints...
  5. 75gmck25

    Can I use this hole for filling oil?

    You just need to put a rubber grommet insert in each of the holes. It might take a little experimenting, because there is one size grommet that fits well on a PCV valve on the driver side, and a slightly larger (inside diameter) rubber grommet for the breather on the passenger side. Some of...
  6. 75gmck25

    Newbie needs help, replace starter now some gauges don’t work

    Large starter lug should have the main battery cable and at least two smaller cables on it. The two smaller cables are the feed to the alternator BAT terminal, and the power to the junction on the firewall next to the brake booster. They both have a fusible link on the end that connects to...
  7. 75gmck25

    Intermittent steering wander?

    Have you checked to see that you get an equal number of turns of the steering wheel turning full lock left to right? If the steering box is not centered when installed it will not have natural centering of the wheels and the steering linkage when you drive straight ahead. It will look fine...
  8. 75gmck25

    Distributor will hit edelbrock 3764 intake

    Also, when you "move" the #1 cylinder on the cap, the firing order is still the same, so all the other wires on the cap have to move the same number of places on the cap. The cap is indexed to the metal rim of the distributor so that it only reinstalls in one orientation.
  9. 75gmck25

    Front end noise

    My truck with NP203 started making loud clicking noises (not a clunk), and it turned out to be the u-joints (rusted, roller bearings had metal in metal) and the centering yoke in the front driveshaft CV joint. The CV joint has a spring-loaded centering yoke in between the u-joints, and it keeps...
  10. 75gmck25

    CARBURETOR DATED

    Some of the basic Edelbrock intakes, like the Performer, are drilled for both spreadbore and squarebore patterns, so you can swap without using any adapter. GM also recommends always using an insulating spacer (although the stock Quadrajet spacer is only about 3/8” thick). Using a fuel pump...
  11. 75gmck25

    CARBURETOR DATED

    Sounds like it needs a minor adjustment, not a full rebuild. With a warm engine you can easily get too much fuel for a reliable hot start. Try just leaving your foot off the pedal and cranking it if the engine is warm/hot. The newer Edelbrock AVS 2 gets a lot of high marks for simple...
  12. 75gmck25

    RockAuto- 4x4 front drive shaft, '81 K20 -Rock Auto

    I replaced my entire front driveshaft years ago, from a place called Driveshaft Specialists in San Antonio. I lived there, so it was local, and it worked great. Last year I started getting loud clicking noises and determined it was the universal joints in the CV joint of the front driveshaft...
  13. 75gmck25

    Drop In Voltage from Windows and AC on

    I had similar symptoms when my alternator was going bad. With lights and blower on it would drop down to about nine volts at idle, but went to about 12-13 volts when I turned them off. Swapped in a rebuilt 12si 94 amp alternator and it fixed the problem.
  14. 75gmck25

    After installing aftermarket tach the truck will not start

    I speak from experience - if that tach lead connected to the HEI is grounded, it stops the engine from starting. In my case ( on a Ford E150) I had run the tach wire too close to the clutch linkage and a worn spot on the wire grounded on the linkage. I could push down the clutch and the...
  15. 75gmck25

    350 small block

    That’s a really good tip, and one I forgot about since I do it all the time without thinking. If you don’t move the pedal to the floor at least once and then release it again, the choke linkage is resting on the stop and the choke stays in the warm (lean) position. As already explained in...
  16. 75gmck25

    350 small block

    Most stock smog-era SBC’s will handle up to 12 degrees base timing without any pinging issue. They really have low compression. Have you measured your base timing and base plus centrifugal/mechanical (at about 3k rpm), with vacuum advance disconnected and plugged? A stock distributor should...
  17. 75gmck25

    QJet Questions

    You need a battery or a 12 volt power supply for testing, not a battery charger. Even a bunch of D cell batteries taped together can give you the 12 volts. A battery charger may work, but the output can spike quite a bit when very lightly loaded.
  18. 75gmck25

    350 small block

    For a carbureted engine, it sounds like it works as designed. - on a cold engine the choke closes a flap in the carburetor to reduce (or choke) air flow and make the mixture richer. As the engine warms up, the choke slowly opens to allow more air, and finally opens completely. Older...
  19. 75gmck25

    454 engine rebuild and intake gasket leak

    I also found that the old bolts for my stock intake on an SBC were just a little too long for the thinner flange on the intake. I'm not sure how the BBC compares. Some of the SBC bolts (center?) go through the head into the valley, so no issue other than making sure they have RTV to stop oil...
  20. 75gmck25

    HEI module dwell time.

    IIRC, .060 plug gap was an early spec for HEI, maybe when they were trying to improve the burn for emissions. Later on they found it put too much stress on the ignition to consistently fire across the wide gap, and revised the specs. I think the revised GM spec was .045, but I’m not positive...
  21. 75gmck25

    No chassis electrical

    Another possibility, since you have power to lights, but apparently no ignition-switched power. During your restoration, did you remove or drop the steering column? The ignition key turns a small toothed rack, which pulls a rod running up and down the column, and the actual switch is...
  22. 75gmck25

    No chassis electrical

    Do you remember hooking up the instrument panel ground? Should be a black wire up under the dash, and on an ‘87 connected to a ground bus bar on the firewall up above your feet. Also check to see the body is grounded to the engine (braided wire on the back passenger side of the engine) and the...
  23. 75gmck25

    Best header back exhaust package for a 1985 K10 short bed

    Most universal kits (priced under about $125-$150, without mufflers) have instructions for both short and long bed trucks. You just leave out or shorten one of the intermediate pipes. The hangers they provide are usually inexpensive universal hangars. They work, but are nothing like OEM. I...
  24. 75gmck25

    Lost ignition!

    If you can jiggle it enough to get it to turn the key, then you should be able to access the release and remove the lock cylinder. Then just buy a new lock cylinder, or have a locksmith make you a key that matches the one you have. Process for removal of the lock cylinder varies a little by...
  25. 75gmck25

    C20 - Trailering vs. Camper Special

    I have only seen the 11,000 GVW rating on a C30 or K30, and I think it was a 4 door crew cab. Someone has done some swapping of something if your truck is only a heavy half. Based on the hub caps, you do not seem to have 8 lug wheels or a 14 bolt rear axle, so it’s only a half ton. Maybe...

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