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  1. 75gmck25

    Square body chevy truck gear ratio

    Try one of the rpm calculators and play with gear ratios until you get the highway rpm you want. I have 4.10 gears and stock 31” tires. IIRC, it runs about 2800-3000 rpm at 60 mph, and I usually don’t drive faster than about 65. It’s kind of “busy” at that speed, but it runs smooth and I’m...
  2. 75gmck25

    No accessories power

    I agree, switch may be out of adjustment. Another common problem is that the small rack on the end of the key cylinder is cracked, and its not pulling the rod up and down the column properly. When you turn the key it moves a toothed rack on the end of the lock cylinder, and that rack pulls a...
  3. 75gmck25

    Old man constantly asked to drop his truck.Any stock height C10s left in the world??

    I think it looks really goofy to drop a relatively stock truck. It does not improve the look, and serves no purpose. YMMV
  4. 75gmck25

    Advice on Transmission Fluid Change for 1980 C10

    Stock TH350 is a very durable, reliable transmission. Many sources of aftermarket parts if you want to build it to be even stronger.
  5. 75gmck25

    Faulty rigged

    Assuming you still want dual tanks - The six port solenoids with only a single power terminal have been unavailable for several years. If you can’t find a NOS solenoid, then the best choice is to switch to the newer version with a six wire connector. There are articles on the net that explain...
  6. 75gmck25

    Alt Replacement Options? A bit confused.

    94 amp 12si is very easy to find, either rebuilt or new. However, mine has a v-belt pulley, so my Lester number (Lester is a standard cross reference number system for alternators) won’t work for your application. When I upgraded from a 10si I figured mine out using info from the Mad...
  7. 75gmck25

    First real drive! Not tragic but not good. I think I need carb advice.

    Two port fuel pump works fine, but might be a little more prone to vapor lock in really hot weather. If you haven't replaced a fuel pump before, check out a few sites that explain how to hold the rod up while you insert the pump lever. Car sites will mention that some SBC blocks have a bolt...
  8. 75gmck25

    First real drive! Not tragic but not good. I think I need carb advice.

    AVS2 has a great reputation for excellent driveability. Seems to work better than the old 1406. Does seem like a flaky fuel pump. Is it a 3 port fuel pump, with one rubber line in, one rubber line to a fuel return, and a hard line running up to the carburetor? Most of the time the factory...
  9. 75gmck25

    ANYONE USED VORTEC HIGH SWIRL HEADS ON THEIR GEN-I SBC?

    Are you sure about exactly what you have? Vortec heads and swirl are usually not used in the same sentence (although the Vortec port may have a swirl). Swirl port was an older head design, but Vortec heads were used about 1996-2000 on the L31 SBC roller block.
  10. 75gmck25

    Trailer wiring

    A guess at two possibilities/guesses, considering that maybe these vehicles were wired for to serve an “international” market. However, very odd that the dealer would not have a wiring diagram. - wiring of plugs for European trailer power/lighting is different, so I assume color coding of...
  11. 75gmck25

    Really tight front brakes!

    Process I recall is: - Slowly turn the rotor, and at the same time snug the nut down with a wrench to seat the bearing (I think the book lists a torque setting to use) - loosen up the nut about a 1/2 to 1 turn with the wrench, and then tighten it down again with your fingers - turn the nut just...
  12. 75gmck25

    First real drive! Not tragic but not good. I think I need carb advice.

    Look at the picture of my ‘75 Quadrajet and you can see the number (7045583) on the throttle linkage side. In the other picture you can see 3 ports on the front. - small fitting on the right goes to the vacuum advance - slightly larger port with a raised ridge is for the vapor canister (I...
  13. 75gmck25

    Edelbrock carbs on a 350 sm blk

    I have had an AFR gauge for quite a while, and it’s really useful. Start out by checking the transfer slot exposure to ensure it has a square shape at idle, install the carburetor, and adjust mixture screws for best vacuum and/or rpm. Don’t get too fixed on getting a specific idle AFR, since...
  14. 75gmck25

    Edelbrock carbs on a 350 sm blk

    A frequent complaint with the Edelbrock is a bog when transitioning from steady rpm cruise to quick acceleration. Changing the hole position of the accelerator pump rod is one possible fix, but may be ineffective. However, the bog can often be resolved by switching to a higher vacuum rated...
  15. 75gmck25

    Which ground do I start with?

    IIRC, the cargo lamp housing is insulated from the truck with small spacers to stop it from being grounded. It always has power on the orange wire. If the interior lights are on, and the cargo light switch is on, then for correct operation the cargo light has a ground through the door switch...
  16. 75gmck25

    Rochester Quadrajet Woes

    Take a close look at the throttle linkage side of the carb and get the Quadrajet number. This tells you which carb you have (original or later), and you will need it to get the right rebuild kit. For example, my original 1975 Quadrajet is 7045583, which is an older version, but I am currently...
  17. 75gmck25

    Big block running hot. Can’t figure out the issue

    Not to nitpick too much, but stoichiometric (best) AFR for gasoline is about 14.7. 14 is slightly rich, but that should actually help with cooling.
  18. 75gmck25

    Tool for adjusting idle

    Original Quadrajet idle screws are usually a double-d shape, and there is a flexible carb tool that has that special end on it. When I rebuilt my Quadrajet, the kit came with new idle screws with a hex end that has a screwdriver slot in it. Your carburetor also had factory caps or casting over...
  19. 75gmck25

    Steering Help

    One simple check - make sure all the air is out of the system. GM book says to jack it up with both front wheels off the ground. Then start the engine and slowly turn the steering wheel full lock to lock at least ten times. At the same time I would have someone else turn the steering...
  20. 75gmck25

    brake pedal has no pressure

    All good suggestions. If the seal is torn or damaged inside the master cylinder it will not seal against the cylinder, and the pedal goes to the floor. Seal often gets damaged while bleeding an old master cylinder that has built up a ridge inside. Ridge is buildup where the seal has stopped...
  21. 75gmck25

    82 Sierra Grill alternatives

    When you start swapping grills, remember there are sometimes also differences in mounting brackets. I have about a ‘79 grill on my ‘75, and I had to swap the metal mounting brackets for the grill. Not hard if you have a donor vehicle. I would like to have a true ‘75 grill so it would have the...
  22. 75gmck25

    First real drive! Not tragic but not good. I think I need carb advice.

    One strong recommendation is to immediately convert it to HEI ignition. It is very reliable, and does not require periodic adjustment like you will need with your points ignition. Lots of large cap HEI distributors available from aftermarket, or you could even get one from pick and pull...
  23. 75gmck25

    First real drive! Not tragic but not good. I think I need carb advice.

    Also get number off the side of the Quadrajet. For example my ‘75 Quadrajet is 7045583 YZ.
  24. 75gmck25

    A/C Question

    I do not have a write up, but I have a lot of pictures and a list of everything used. This could motivate me to write it all down in one place.
  25. 75gmck25

    A/C Question

    The old A6 compressor is a true boat anchor, and it has heavy brackets to keep it supported. It’s also now old and not very reliable (do a search on A6 Black Death). It uses R12 and mineral oil, while current systems are usually R134 and PAG oil. A complete explanation of how to convert or...

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