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  1. C10MixMaster

    Some timing questions (experiencing some spark knock)

    vacuum advance is working. the fact you can advance the mechanical advance and take a a pic of it advanced shows there is something wrong there. it should spring back on its own. You might have to remove the distributor and disassemble the shaft, I think these 2 parts are rusted or gummed up...
  2. C10MixMaster

    Some timing questions (experiencing some spark knock)

    that doesn't sounds right. 30 is a lot for initial timing. If you rev the engine how much advance do you get? 36 should be about max for initial and mechanical not including vacuum advance. Things I would check advance springs Missing broken?, advance seized , advance weights badly worn...
  3. C10MixMaster

    What have you done to your square lately??

    resealed the A6 A/C compressor, hopefully no more oil line on the hood. Out with the old ceramic seal in with a new modern seal .
  4. C10MixMaster

    Emissions sticker

    not rpo but window sticker with current mods
  5. C10MixMaster

    Emissions sticker

    the 4rth digit in the vin tells them the weight class of the truck 1= 10 series 1/2 ton LD emissions, 2=20 series 3/4 ton HD emissions, 3=30 series 1 ton HD and a 4=10 series heavy half ton HD emissions. plus in 77 the gvwr is on the vin plate.
  6. C10MixMaster

    Emissions sticker

    I didn't think there was a tune up label on the 77 HD emissions trucks , yes I do need / want that label to.
  7. C10MixMaster

    Need help with duel tank set up 82 c20

    This should get you in the right direction. Just omit the wiring for the electric fuel pumps , The line marked supply / return to engine would be the lines to / from the mechanical fuel pump. The vent lines (not shown here) from the tanks "T" together and connect to the vapor canister, the gas...
  8. C10MixMaster

    Carburetor linkage bracket for Q-jet 700R4

    the only other thing is length of the cable, so it will adjust. I believe there are 7-8 different cables available. mine was from an 88 gmt400
  9. C10MixMaster

    Carburetor linkage bracket for Q-jet 700R4

    turbo 350 throttle lever 700r4 throttle lever notice it bent farther forward my bracket , it might be from a 350 not sure, just junk yard parts, but it does run the tv cable horizontal with the carb
  10. C10MixMaster

    Smog Pump

    https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html here's a link to the GM heritage website there you can down load the options manual for your your truck . In the section after the engines It will show the emissions equipment the factory installed depending...
  11. C10MixMaster

    What have you done to your square lately??

    Its a ZZ4 crate motor , the heads are the ones they used in the corvette TPI motors , 58cc 1.94/1.50 D port exhaust
  12. C10MixMaster

    What have you done to your square lately??

    replaced the freeze plugs and did a valve adjust while the a/c compressor was out of the way
  13. C10MixMaster

    Smog Pump

    no its just a large pdf file. just down load and windows will open it.
  14. C10MixMaster

    Smog Pump

    the top bracket is also the bottom bracket for the alt.
  15. C10MixMaster

    LMC truck has the wrong window regulator rollers....

    I had the same issue several years back. I ended up pressing the pin out of the roller and then welded the pins in instead of peening them. then pressed the roller back on.
  16. C10MixMaster

    Smog Pump

    http://www.mediafire.com/download/wesxnrokz4n3x39/ST_330_81_1981_Chevrolet_Light_Duty_Truck_10_to_30_Service_Manual.pdf here is a link to a downloadable factory manual from the reference section on GMSB page 845 section 6E-16 has a drawing of the pump and brackets
  17. C10MixMaster

    New to the forum with question about 76

    it is common for the earlier square bodies it was in all the 1/2 tons
  18. C10MixMaster

    What have you done to your square lately??

    Found my alt fan had blown apart fortunately I had a spare
  19. C10MixMaster

    700r4 locking up in 2nd also locking too fast. Vac switch?

    the switch with the blue connector is the 4th gear switch if that switch is bad (stuck closed) or the black wire attached to it is shorted to ground the trans can go into lock up any time there is power to the transmission.
  20. C10MixMaster

    700r4 locking up in 2nd also locking too fast. Vac switch?

    Im going to say you have a wiring issue and or a bad 4th gear switch. If you pull the pan and post a pic of what switches it has that would help. In your truck it should only engage in 4th. In 4th gear the 4th gear switch closes and complete the circuit to engage the torque converter...
  21. C10MixMaster

    Stepside bed mounting

    The sills connect to the bed sides and form a grid with the wood and the antiskid strips (top metal strips). Kind of got to look at it as the bed is its own separate assembly.
  22. C10MixMaster

    Stepside bed mounting

    I believe all long bed ,short bed ,step and fleet sides used a total of 8 mounting bolts 2 pair in front 2 pair in the rear. All your other cross pieces are just to attach the wood so they dont need the extra mounting holes.
  23. C10MixMaster

    What have you done to your square lately??

    Thanks Its corvette atomic orange. My son in law gave me the seal after his truck was totaled, it came with the corner pieces to I dont know if they were included or ordered separately. everything about the bottom corners was difficult, fitting the glass and the corner pieces. There...
  24. C10MixMaster

    What have you done to your square lately??

    Upgraded the rear window gasket from a one piece to the deluxe chrome style. I have to say the corners made it a pain in the ass
  25. C10MixMaster

    What have you done to your square lately??

    I think I pulled it from a 01 Tahoe ? but yes Gentex auto dim with compass and outside temp. If you get one dont forget to get the temp sensor behind the grill

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