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  1. J

    Carb at high alt

    Big updates: I installed a mechanical fan and it works great!! -summit racing 7 blade 19” steel fan -Hayden severe duty clutch -LMC 2 piece shroud for small block trucks About $200 altogether. AC is still cold. I’ve climbed several intense grades in the Sierra Nevada mountains, and never been...
  2. J

    Carb at high alt

    So, I should just convert back to a mechanical fan and the giant wind tunnel factory shroud? I guess the physics check out on that. My new 2023 RAM 2500 has a mech fan, and it never gets hot, even when towing heavy up serious grades. Should I use a clutch or direct connection flex blade fan? I’m...
  3. J

    Carb at high alt

    I threw away the giant factory wind tunnel shroud and hard mount fan a couple years ago. I always assumed the airflow would blow right thru the fans at highway speed. I’ll either look around on summit for a better shroud or just cutting some wind flaps in my current setup. or could I remove my...
  4. J

    Carb at high alt

    https://www.gmsquarebody.com/threads/overheating-climbing-a-mountain.40181/ Here is a thread of mine from a year ago. I have a big new 4 core alum radiator, electric 2700cfm fans. I’m guessing it’s always gonna run hot because I have a 383 with decent compression and a big lumpy cam. Other...
  5. J

    Carb at high alt

    Cool thanks guys. Do you think leaning it out would help with heat buildup as well? The motor quickly gets up to 230* when climbing. Is that normal?
  6. J

    Carb at high alt

    I’m looking at doing some high altitude overlanding in the Sierra Nevada mountains. I live at 2000 feet MSL, and I’d like to drive up to 10,000feet MSL. Are there any quick hacks I can do to keep the engine alive at that altitude? it’s a 383 with an edelbrock 600 carb
  7. J

    Sagging front springs?

    I think the ride quality is just fine. I was initially concerned about the height difference of the wheel wells. After taking several measurements, the 2 front springs are perfectly symmetrical. I don’t see any broken bolts or pins. The parts to swap in new springs are about $450 altogether...
  8. J

    Sagging front springs?

    I have a 1978 GMC K25 with a 383 SBC and TH350/NP203. I can’t tell if the front leaf springs are worn out or not. -the driver side wheel well sits about 1” higher than the passenger side. -the springs have an upward bend. Each front spring bends up 3” total. -the springs have 2 ply. Even...
  9. J

    What's the good AC compressor these days?

    I’ve had trouble with the “4 seasons” brand A6 style compressor. I’m on my 3rd one in a year. I installed one myself, and had the other 2 professionally installed by reputable shops. The clutch in the first one actually caught on fire.
  10. J

    Overheating climbing a mountain

    Ah. I have neither of those things. My fans are nice and tight to the radiator back end, but I have no aero help in front by the core support. I’ll rig something up this weekend.
  11. J

    Overheating climbing a mountain

    I think I found the culprit. I pulled the temp gauge sensor & dropped it into a pot of boiling water. The needle shot up past 240*, which is physically impossible. Once water boils, it can’t get above 212*. I shot the sensor & water with an IR temp gun just to verify. My Equus brand temp gauge...
  12. J

    Overheating climbing a mountain

  13. J

    Overheating climbing a mountain

    Hello, I’m a longtime reader, first time poster. My 1978 K25 resto project is running great, but it overheats when driving up the Sierra Nevada mountains. Tech stuff: -383 SBC (mercury marine block) -9.5:1 compression -Moderate cam (boat cam) -Summit iron vortec heads. 64cc chambers...

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