1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

'76 GMC 1 ton (454) radiator???

Discussion in 'Engine & Performance' started by OldBlueDually, Mar 3, 2021.

  1. OldBlueDually

    OldBlueDually Full Access Member

    Posts:
    1,084
    Likes Received:
    3,011
    Joined:
    Jun 8, 2020
    Location:
    Minnesota
    First Name:
    Justin
    Truck Year:
    1976 GMC
    Truck Model:
    C30
    Engine Size:
    455 Olds
    Gent's, I am trying to figure out what radiator to get for my truck and need some assistance.

    My truck did not come with a radiator so I am trying my best to find a 4-core that will work, but I do not know the proper/stock dimensions of the radiator.

    Can anyone give me some advice, or where to go?

    Specifics of truck;
    76 GMC Sierra Grande, C30/35 crew cab, 454, with A/C

    So far, here is what I have found, but I am not sure what will work. What do you guys suggest?

    This one below according to Amazon met all the requirements of the truck;

    https://www.amazon.com/dp/B01MYUVC7...wVehicle=1&vehicleId=9&vehicleType=automotive

    LMC part number 32-2945;

    https://www.lmctruck.com/1973-87-chevy-gmc/cooling-system/cc-1973-87-radiator

    RockAuto Ultra Power 730;

    https://www.rockauto.com/en/catalog...54cid+v8,1406933,cooling+system,radiator,2172

    Summit Racing radiators (a bit more $$$);

    https://www.summitracing.com/search...eywordMatch&SortOrder=Ascending&keyword=4-row
     
  2. bucket

    bucket Super Moderator Staff Member

    Age:
    39
    Posts:
    23,468
    Likes Received:
    10,108
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    Do you currently have a stock fan shroud or top radiator mounting panel?
     
  3. OldBlueDually

    OldBlueDually Full Access Member

    Posts:
    1,084
    Likes Received:
    3,011
    Joined:
    Jun 8, 2020
    Location:
    Minnesota
    First Name:
    Justin
    Truck Year:
    1976 GMC
    Truck Model:
    C30
    Engine Size:
    455 Olds
    Yes, I have both of those.
     
  4. bucket

    bucket Super Moderator Staff Member

    Age:
    39
    Posts:
    23,468
    Likes Received:
    10,108
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    If you have the flat upper panel, you need the tall 19" radiator. If you have the upper panel with the big step down in it, you need a 17" tall radiator. Core thickness and tube design is kind of up to you.
     
  5. sirweesarunch

    sirweesarunch Full Access Member

    Age:
    57
    Posts:
    171
    Likes Received:
    278
    Joined:
    Nov 4, 2019
    Location:
    Oceanside
    First Name:
    John
    Truck Year:
    1980
    Truck Model:
    K30
    Engine Size:
    454
    I’m in the same boat as you , worse actually cuz i need engine oil cooler in mine. You need the largest radiator they sell. 19” tall 34 1/2” wide. I wanted brass. Found a radiator shop who ordered me one. Very difficult to find. $600. Mother—/// .


    Sent from my iPhone using Tapatalk
     
    Curt likes this.
  6. OldBlueDually

    OldBlueDually Full Access Member

    Posts:
    1,084
    Likes Received:
    3,011
    Joined:
    Jun 8, 2020
    Location:
    Minnesota
    First Name:
    Justin
    Truck Year:
    1976 GMC
    Truck Model:
    C30
    Engine Size:
    455 Olds
    THANK YOU for that information!!! I have nothing to base it on. I do have a 4 core radiator from a 69 Olds, but not sure of its condition. I would rather put in a new and be done with it.

    My 76 GMC parts truck (the green one) has that shorter radiator with the step down in the upper bracket. In my truck I do want the 4 core, because I plan to use the trans lines in it, and I plan to run AC on the truck some year.

    My goal right now is to get this monster on the road!! AC can come later.


    Holy balls man! However, at least you got what you want!!!!

    I know the feeling of wanting something in particular. I FINALLY found shorty headers for my build for this truck (455 Olds), and they come out in the same stock position as the cast iron exhaust manifolds. They are $475 for the pair, but made of stainless, polished & a 1/2" flange....so it will last forever.

    Regular headers I could get for half that price...
     
    sirweesarunch likes this.
  7. Bextreme04

    Bextreme04 Full Access Member

    Posts:
    1,290
    Likes Received:
    1,366
    Joined:
    May 13, 2019
    Location:
    Oregon
    First Name:
    Eric
    Truck Year:
    1980
    Truck Model:
    K25
    Engine Size:
    350-4bbl
    1997 K2500 Suburban 454 Radiator will fit and is the largest size you can find. It’s 4 core and has a huge transmission and engine cooler. $50 at most parts yards. They should be the same for any 1996-1999 3/4-1ton suburban or Silverado with a 454. The 2007-up Silverado dual electric fans are a perfect fit for this radiator as well. Just in case you wanted to go big. I got both for $100 total for the pair.

    34204961-495D-4DF2-B5E1-7A5198811340.jpeg
     
    bucket and OldBlueDually like this.
  8. OldBlueDually

    OldBlueDually Full Access Member

    Posts:
    1,084
    Likes Received:
    3,011
    Joined:
    Jun 8, 2020
    Location:
    Minnesota
    First Name:
    Justin
    Truck Year:
    1976 GMC
    Truck Model:
    C30
    Engine Size:
    455 Olds

    NICE!! Would it fit a 76 though? I am looking for a direct bolt in & be done.

    I plan to go aluminum, and to get a fan/clutch assembly on this.
     
  9. Bextreme04

    Bextreme04 Full Access Member

    Posts:
    1,290
    Likes Received:
    1,366
    Joined:
    May 13, 2019
    Location:
    Oregon
    First Name:
    Eric
    Truck Year:
    1980
    Truck Model:
    K25
    Engine Size:
    350-4bbl
    Yes it will fit with no mods. It is the exact same size as the C30 454 radiator that was rare. There was a thread somewhere and I ended up sending a member here the original fan and clutch that came stock on my donor motor. It was a 9 blade reverse flow fan. I would see if I could find a 1996-99 suburban in a local junkyard and pull the whole shebang... radiator, fan, clutch, and shroud. Here’s some pics of the fan I sent out a few months ago. And a pic from the front of my donor. You can see how big around that fan is, the shroud fits level and should bolt up to the factory upper metal radiator bracket. 7789F2FC-5B71-4337-8B01-958B6DE7FDD6.jpeg 1D1AD2D8-17F7-4FCB-B831-97D6444CB5B6.jpeg
     
    OldBlueDually likes this.

Share This Page