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Thread: General Motors

  1. #21
    Vulture of The Western World Eric's Avatar
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    Re: General Motors

    Quote Originally Posted by DonTom
    "Vortec"

    I keep seeing that name, but what does it mean?

    -Don-
    Nothing - it's just an advertising gimmick....

    Similarly, Toyota has "IForce" V-8s....

  2. #22
    Senior Member misterdecibel's Avatar
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    Re: General Motors

    Do the GM truck engines have aluminum blocks?

  3. #23
    Vulture of The Western World Eric's Avatar
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    Re: General Motors

    Quote Originally Posted by misterdecibel
    Do the GM truck engines have aluminum blocks?
    I believe at least some do; maybe all of them are now aluminum. Let me check into it...

  4. #24
    mrblanche
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    Re: General Motors

    I believe the truck version of the Vortec engine is the LQ9. One of the magazines (Car Craft or Hot Rod, not sure which) did a build-up of one, and got to 450 hp quite easily.

  5. #25
    D_E_Davis
    Guest

    Re: General Motors

    Quote Originally Posted by chiph
    The 350ci I had in my 1975 Impala had the nylon gear. I went through two of them.
    They were pretty common despite their drawbacks. Dad's 48 Hudson had one, and it failed.


  6. #26
    DonTom
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    Re: General Motors

    "They were pretty common despite their drawbacks. "

    Does GM still use the nylon timing teeth? No doubt it's to reduce the noise, but I would rather have noise than a ruined engine. That was those days equivalent to them using timing belts with interference engines today.

    And if they no longer use them, what year did they stop?

    -Don-

  7. #27
    D_E_Davis
    Guest

    Re: General Motors

    Quote Originally Posted by DonTom
    Does GM still use the nylon timing teeth? No doubt it's to reduce the noise, but I would rather have noise than a ruined engine. That was those days equivalent to them using timing belts with interference engines today.

    And if they no longer use them, what year did they stop?
    Boy, I sure don't know. My 96 Lumina uses a Gilmer (toothed) belt for the cam drive, and it's an interference engine. When I had the belt replaced at 55K miles it was pretty ragged. Now, at 94K miles, it's close to time to do it again.


  8. #28
    DonTom
    Guest

    Re: General Motors

    "Vortec"

    What the difference between a Vortec engine and one that is not?

    -Don-

  9. #29
    mrblanche
    Guest

    Re: General Motors

    Quote Originally Posted by DonTom
    "Vortec"

    What the difference between a Vortec engine and one that is not?

    -Don-
    Well, first of all, the Vortec engine has very efficient heads. They are so good, they are often used in hot rods. I wouldn't mind a pair, myself. However, if you use the Vortec heads, you have to use an intake manifold made especially for it. And there are other problems.

  10. #30
    DonTom
    Guest

    Re: General Motors

    "However, if you use the Vortec heads, you have to use an intake manifold made especially for it."

    I knew that much, because a few years ago when I ordered the stuff for my MPFI in the junked RV, I was asked if I had Vortec heads. I said "no" because I assumed if I had them, I would know it. That was the very first time I heard the term.

    What year did they start with the Vortec heads?

    -Don-

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