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V6 vortec problems

Discussion in 'General Chevy & GM Tech Questions' started by silverado90, Apr 17, 2012.

  1. silverado90

    silverado90 New Member

    Hi all

    I've got a 90 Silverado steps side with a Texas stagecoach kit on it. It was imported into the uk in the 90's and has been in my family since 2000 and with me since 2009.

    A valve burnt out back in January and we decided to replace the v6 with another vortec. Thing is we can't find another one in this country. We bought one from a 96 blazer but pretty much everything was totally different including the inlet manifold. My dads got a 93 day van with a 4.3 v6 in it but that's not going spare but is there much chance it's going to be the same as the one in my truck. We even thought about putting a v8 in it but that could cost a couple of grand plus I like my manual v6. It's something a little different.

    Please help as I am now driving a 92 Saab 900 :(

    Stephanie x
  2. Strino78

    Strino78 Member

    When you say "we decided to replace the v6 with another Vortec", are you saying it had a 4.3L Vortec V6 in it when you purchased it, or you put one in? Vortec engines were not available until 1996. It sounds like you're under the impression that all 4.3L are Vortec motors, because you commented that the '96 4.3L donor motor is completely different.

    If its a pre-1996 4.3L your 4.3L is a plain-jane 90 degree V6, which is really a 350 V8 with two cylinders chopped off; the bore and stroke is the same. You can swap in the 4.3L Vortec along with the computer and the engine wiring harness --- or you can use a plain-jane 4.3L and swap in some Vortec heads -- and keep your stock computer and harness.
  3. silverado90

    silverado90 New Member

    Hi Strino

    Thank you so much for your answer. It's cleared a lot up for us!

    We've always been told that its a vortec engine which is a v8 with 2 cylinders cut off not that they are 2 different beasts! Go figure

    We are now looking for the right engine and hopefully it wont be too hard to find! Fingers crossed!

    Thanks for your help :)
  4. Strino78

    Strino78 Member


    Glad I could help you. You're not wrong in what you said though. Both the Vortec and non-Vortec 4.3L blocks have the same bore and stroke as a 350. 4.00" Bore and 3.48" stroke. Some, but not all of the parts on a 350 will swap over to a 4.3. The Vortec has improved cylinder head and intake designs. You're able to swap the heads and intake on a non-Vortec for a nice little performance upgrade without having to swap over all sorts of crazy electronics.

    Hope this helps.
  5. silverado90

    silverado90 New Member

    That throws up a couple more questions. We bought a vortec and nothing seemed like it would fit. The sensor positions were all wrong the fly wheel (???) was different and it looked like a totally different engine.

    At least we know now and that's fab as we can stop looking at the wrong engines and bits now!

    Next question: does anyone have a brand new crate motor already in the uk they want to sell?

    No?? ..........didn't think so :) x
  6. Boonduff

    Boonduff Member 3 Years 100 Posts

    Not true! The L35 4.3L used between 1992 and 1995 was also labeled as the Vortec. It was optional in the S-10, S-10 Blazer, and the Astro Vans, and never in the fullsize trucks. It put out 190-200 hp and 260 lb-tq. you can identify it by its intake manifold which has Vortec down the center.
    35[​IMG]
  7. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    ^^right the vortec labeled motors made their debut in the blazer, but I think what he meant was no vortec was available in a CK series until 19996 which is true, till then they were all TBI motors
  8. Strino78

    Strino78 Member

    Yes, thank you. The OPs vehicle is a '90 Silverado. It never had an option for a Vortec.

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