k20

  1. K

    1976 K20 Front Of Front Leaf Spring Hanger Damage

    Hi, I've got this K20 frame stripped down to be sandblasted, but I scuffed up the front of front leaf spring hanger a bit cutting the bolt out. I'm assuming it's no problem, but figured I'd ask what people suggest. Every step of this truck rebuild is new to me, so it's hard to not second guess...
  2. barrymattern

    K20 vs. K30 Difference

    Hi All, I'm newer to working on these trucks, and I'm just getting started on a project to turn my 1985 Chevy Scottsdale C10 automatic into a 4-wheel drive manual. I recently purchased a donor 1984 Chevy Scottsdale that was sold to me as a 3/4 ton K20, and the plan is to swap the '85 body onto...
  3. G

    Rear leaf spring bracket to crossmember support?

    Hello All; first time posting so apologize if not familiar with posting etiquette. My first resto on my 86 K20 is underway and am struggling to identify and locate the crossmember support bracket for the rear forward spring as seen in the photo that has holes due to necrosis. Anyone know if...
  4. JodysCars

    Steel Wheels K20

    I have an 84 K20. I have about 6" of lift and wanting to add about a 35" tire. I like the steel wheel look but I don't think I can find a tire that tall that will fit my factory 16's. Has anyone had experience with the aftermarket steel wheels that are stock styled?
  5. C

    In need of a th400 to np203 adapter!!!

    I recently broke the rear housing of my th400 along with the adapter to the np203. (I believe is the factory drivetrain. 1976 k20 4x4 big block.) I had a good th400 case laying around Ive swapped everything over to. The issue is trying to find the adapter. The casting number is 376129. I have...
  6. Craig Nedrow

    Daily driver turbo

    My 454 in the K20 is awesome, except the gas mileage. That excuse brings me to this subject, LS swap with a single turbo. I am a machinist by trade, 40 years, retired. However a longtime shop where I trade needed a machinist, so now I am the guy that does all the internal work, (bore, hone...
  7. Subourbon

    Glow plug relay? Or controller? Short cycle

    Hey guys n gals, 1982 k20 suburban 6.2 diesel automatic trans. Th400 with overdrive. I've made this a bit of a long post because i crammed it with history and details, and questions, figured that would me get clearer answers than Glow plugs no work, help. So the glow plugs give me a hard...
  8. klarster

    '85 K20 350ci died out on the road not getting fuel to carb, replaced fuel pump and now not getting fuel to pump

    Hi folks! First post in this group so I'll try to cover all the bases in an effort to get the best outcome. Bought an '85 K20 with factory 350 and manual tranny off a college kid a couple months ago with intentions to drive while I do some work on my Jeep to get it roadworthy again, then begin...
  9. MadMadi

    HELP motor mount issue

    Look at pictures. To make a long story short, rebuilt this 85 chev k20 about 10yrs ago. It has a 70’s style frame because that’s all I could get at the time. The motor is a 79’ 350 and the rest of the body is an 85’. HERE is the problem. Need to replace motor mounts and trans mount and have...
  10. Subourbon

    License plate light bulb/assembly

    Hey everyone, Hope youre all doing well. So, license plate bulbs. I had a look at this and saw that: 1. It wasn't connected 2. The bulb is probably original to the vehicle (1982) and there out. 3. Don't have much history about the vehicle so I dunno if it was submerged at all. I traced back to...
  11. Preston Tucker

    383 vortec high compression

    I am building myself a 383 Stroker and wanted to run a set of 96 L31 Vortec heads on top of it because I have heard they have way better flow than any other stock head for a small block. Its supposed to be a cheep hp swap (around a 40 hp gain I have been told) Well I have been doing some...
    • Preston Tucker
    • Thread
    • 383 stroker 383 swap crank swap engine build high compression high octane k20 l31 small block vortec
    • Replies: 24
    • Forum: Engine & Performance
  12. Connor koehler

    My first square body Chevy!

    I just picked this bad boy up and I’ve already started to tinkering with it. It’s a 1980 k20 4x4 with a 454. I made a HD bumper soon to have a winch in it, and yesterday put some 2” lift springs on the front. I’m thinking of making this the family bug out wagon, I’ve got another battery and...
  13. Connor koehler

    New square body owner!

    I just picked this bad boy up and I’ve already started to tinkering with it. It’s a 1980 k20 4x4 with a 454. I made a HD bumper soon to have a winch in it, and yesterday put some 2” lift springs on the front. I’m thinking of making this the family bug out wagon, I’ve got another battery and...
  14. muddslut

    Need help with 85 Sierra running rough

    Having some trouble with a truck I came across last week. I’m gonna try to make it short and sweet with what I know so far. So, the trucks a ‘85 Sierra w/ the 350 paired with the 4 speed manual. It has an edelbrock 600 carb manual choke. And a micro electric fuel pump pushing 4-7 psi. (I have...
  15. J

    Cab swap help and pointers

    Hi everybody, I'm new here to the forum but I have some questions but first I'll explain my situation. Currently right now I'm building a truck, basically from the ground up from about 3 different donor trucks. Right now I have rolling K20 chassis, with tank and fuel lines, that's it. I'm...
  16. Preston Tucker

    Rare (ish) 1974 gmc k20!

    Hello every body! I am new to the site but it is the best thing that has happened to me so far! Its awesome, you all are. I am taking on a full restoration of a 1974 gmc k20 that i saved from the junkyard for a price of 50 dollars. Its no gem but is not just the average rusty squarebody! It was...
  17. E

    K20/K30 frame

    Hello! I’m new to the forum. I’m building my truck from the bottom up. I have a frame for it, 3/4-1ton, but it’s for a single cab, I’m looking for a 1 ton Crew Cab frame for a square body, in New York. Has anyone got a tip of one or selling one? Thanks!
  18. B

    BBC Running terrible

    BBC fires up 1st try, but runs like a dog. Have to feather the pedal to keep it running. NOT drivable! Water/antifreeze is always perfect, never low. Has new distributor, cap, rotor, new plugs, fuel filter, fuel pump, regulator, ect. Demon 850 carb. Blowing white smoke but no oil/antifreeze...
  19. Tanner_Shany24

    Need help with very bad sputter with 83 k20 bbc 454.

    Hey guys, recently bought a 1983 k20 with a bbc 454 in it. I like the truck a ton, but it has its flaws, and a lot of them haha. I am 18, and while I have worked on motors my whole life, this is the first carbed motor I have owned, so I am kind of new to the carb game and just want to get some...

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