350

  1. Morgan90

    90 5.7 TBI fuel economy issue

    I’ve got 1990 k2500 with the TBI 350 and the NV4500 5 speed, it has been getting very bad fuel economy recently. Fully stock apart from wheels and tires. My odometer does not work but I’m only getting what I think to be around 400km (250 miles) to a tank and it has the larger 130 litre tank (34...
  2. A

    91 C2500 350 Constant 30 PSI of Oil Pressure

    Got a basket case 91 C2500 350/700r4 that I've been slowly working all the kinks out of. Next up on my list of things to check out is why I have 30 psi of oil pressure at all times. At idle? 30. Cruising around town? 30. Flooring it all the way to redline getting on the highway? 30. I've...
  3. W

    Need options for a new engine

    Hey Gurus, I need some opinions from the guys who do everything in their own shop. I’ve got a 1994 K1500, 350 tbi, nv4500 manual transmission. With the 4 wheel drive and the extended cab with a stepside bed, I plan to keep this truck forever and I’ve fabricated front and back bumpers and soon...
  4. J

    Timing issues

    I have a 1994 chevy k2500 and it started giving me a lot of idle and starting issues, so I started with rebuilding the TBI (never been done, truck has over 300,000 but motor swap was done less than 20,000 ago) and that didn't solve any issues, so I changed the plugs, wires and distributor hoping...
  5. TwistedTahoe

    Losing brakes on full left turns

    Hey guys, just bought an all original 107k mile 1993 Chevy C3500 w/ 350, 4l80, 4.10s, DRW. It has a problem where at a full left turn, I lose all brakes, they come back after a few pumps once I'm off full lock, and all is well. The truck has a hydro boost on it, and I DO hear the occasional...
  6. gt500fiveh

    Can I use rear seats out of a 2002 chevy suburban for my 1998 chevrolet silverado k1500 rear seats?

    i am wondering if i could possibly use rear seats out of a 2002 chevrolet suburban and use them for rear seats in a 1998 chevrolet k1500 truck ext cab, the truck came with no rear seats and i kind of need them since I'm having my kid this year and I'm getting this truck from my cousin, thats the...
  7. J

    Loss of voltage while driving.

    I’m looking at buying a 98 k2500, owner states the power draws while running only, not when parked. I’m worried that he wouldn’t be selling it if it was as easy of a fix like an alternator or a bad connection. Thoughts?
  8. T

    Mystery noise and ses code 43

    1988 k2500 5.7L automatic The noise comes from somewhere in the front half of the truck. It only happens when accelerating just before a upshift (think merging on to highway). It doesn't happen every time I upshift/accelerate, but when it does happen, it's while accelerating. I don't think it...
  9. GMan17

    Should I purchase this 350 SBC

    Hi, I’m looking to purchase this carbureted 350 sbc to swap into my 1990 C1500 that currently has a 305 sbc. The seller said that it “Ran great went with a ls swap stage 2 cam in it also.” Do you think this would be a good purchase for $600?
  10. hilly101111111

    TBI to Carb Swap Guide ?

    Is there a tbi to carb swap guide out there? I have a 1990 GMC K2500 with a 350 TBI motor / Turbo 400 Trans
  11. D

    Blown head gasket 350

    I am looking at purchasing a 1998 K2500 with a vortec 350. It has less than 100k miles on it and the owner stated that he had to get a head gasket replaced on it. What could have caused this head gasket issue? Could it possibly be a tirepatch fix for a bigger problem?
  12. S

    Fuel pump relay signal wire?

    Hey everyone I’m trying to rig up the wire that will keep the fuel pump on with a wire that’s hot when the key is turned on. There are a couple wires coming out of the fuel pump relay and I was curious if I could use one of those and connect it to a wire that goes to the now removed tbi, is...
  13. S

    Edelebrock 1906 vacuum line connections

    Hey I was wondering if anyone had a diagram or example of where they routed all their vacuum lines on an edelbrock carb. I see there are 2 ports for the distributor which one is right for a standard vacuum advance hei? Does the line for the charcoal fuel canister connect anywhere on the carb...
  14. S

    HEI wiring, electronic choke wiring and carb linkage for an edelbrock

    Hey everyone, finishing up the carb swap on my 88 C1500 and I’ve been reading a lot on this forum. From what I’ve read there seems to be a lot of talk over an electronic fuel pump, I don’t believe the 88 model had an electric fuel pump isn’t it manual? Correct me if I’m wrong What would be...
  15. S

    How to connect accessory bracket support arms to an aluminum performance intake manifold on a 88 C1500?

    Hey everyone I’m converting my 88 C1500 350 to use a carb, I’m kinda in a pickle right now, non of my accessory bracket support arms connect to my new dual plane intake. The AC compressor arm nor the belt tensioner arm match up to the intake. One time when I took my truck apart I decided not...
  16. Fred5280

    Alternator to battery post

    I’m having an issue with my alternator, the stud that has BAT stamped behind it is just spinning inside the alternator housing is there a way you guys would recommend to fix this maybe a stud a next size up? or is the alternator done this is on a 92 c1500 w a 350
  17. S

    Intake manifold bolt not fitting

    Installed a new intake for a carb conversion, one of the bolts won’t fit around this raised area, tried using the original intake manifold bolt didn’t fit went out to the hardware store and got a bolt with a smaller head and it still won’t fit, is the only solution to this problem shaving down...
  18. S

    88 C1500 5.7 correct torque sequence for cylinder heads?

    Hey everyone, does anybody know the correct torque specs/sequence for the TBI heads on a 350? Is it the same for every 350 or is it different with the TBI heads? Sorry for the silly question just want to make sure I do this head job right. Thanks!
  19. S

    Intake, distributor and carb recommendations for 5.7 TBI heads?

    Haven’t posted here for a while hope everyone is doing well. I’ve got a tbi 350 in my 88 C1500 and I'm planning on switching over to a carb setup. I’m well aware that TBI heads are inferior to vortec heads but let me explain why I’m keeping them. My truck has been running way rich for a...
  20. 14BoltCorporates

    H or Y Pipe on 350 Small Block

    Gonna put a set of shorty headers on my 350, should I put an h pipe or y pipe in?
  21. L

    96 305 swapped out for 98 350 random missfire

    Recently due to a blown headgasket I’ve had to retire my 305 for the time being and put my 98 tahoes 350 in it, it ran great in the Tahoe, now that it’s in the 96 I have one code and it’s for a random missfire only does it when in gear in N and P it runs fine, side note before I swapped motors...
  22. C

    Engine Running Slightly Rough And Code 42

    Recently I did a cam swap in my 1994 k2500's TBI 350. After which the engine ran quite smooth and I was pretty happy with it. Over time however I started to notice it was progressively running a little rougher, like I could hear each individual cylinder firing more distinctly. The last...
  23. C

    Trans Swap

    TLDR I have a 95 K2500 350 Suburban and a 94 k2500 454 suburban, both are 4l80e's. The 94 tranny (no 4th gear) is bad along with the torque convertor I believe, and the frame of the 95 is bad. Can I straight swap the tranny from the 95 to 94? if so can I swap the T-case, and Torque convertor as...
  24. AC89K2500

    Stock 350 3/4 ton transmission options

    Hey Everyone, my name is Ashton from Iowa. I recently acquired a fairly clean ‘89 3/4 ton Chevy with a stock 350 small block. It currently has the 3 speed manual which I find to be horrendous for anything above 55mph. I’m looking into the idea of a 4l80 swap and was wondering if anyone has a...
    • AC89K2500
    • Thread
    • 3/4ton 350 4l80e swap 4x4 long bed standard cab
    • Replies: 40
    • Forum: Transmissions
  25. 19971997

    1997 C2500 Engine swap w/ TBI Long Block

    Im writing this in a hurry since im on my lunch break but this is what i got going on: Picked up a nicer than normal northern states truck (Indiana) with a trans issue. It would only drive in revrse. I got the tranny rebuilt and the truck drove fine back from the shop. 2 weeks later it had all...

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