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BEGINNING OF THE CAT'S?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CHEVY 4WD, Nov 17, 2002.

  1. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    BEGINNING OF THE CAT\'S?

    When did Chevrolet start putting cats on trucks and blazers?
     
  2. BayouBlazer88

    BayouBlazer88 1/2 ton status

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    Re: BEGINNING OF THE CAT\'S?

    I think 1978 is when the EPA required cats on all vehicles. My uncle has a 77' Silverado and whenever he got new mufflers put on, they didn't require a cat. Hope this helps.

    Matt
     
  3. BLUESMAN

    BLUESMAN 1/2 ton status

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    Re: BEGINNING OF THE CAT\'S?

    My Mother bought a new K/5 in '78 and had no cats,I have a '78 with no cats.I believe that Cali started in '77 or so.Mike
     
  4. mike reeh

    mike reeh 1/2 ton status

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    Re: BEGINNING OF THE CAT\'S?

    in california it was definately '78 for most 4x4's...(chevy)

    in other states it must have been 79 or later

    the reason i say most 4x4s is because I beleive 2WDs may have had cats earlier but im not positive, and heavy GVW trucks may have been cat less even in 78.. but im talking K5/K10/K20 here....

    mike
     
  5. wrathORC

    wrathORC 1/2 ton status

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    Re: BEGINNING OF THE CAT\'S?

    My 77 HD C20 had a catalytic converter. However, it had none of the other emissions stuff.

    I lied. It had a canister but it was only for the gas tank. It didn't even have an EGR valve.

    Starting in 1975 all vehicles with GVW 6,000lbs and under got a catalytic converter. In 1979 the weight was raised to 8500lbs. If they were above those weights sometimes they got them and sometimes they didn't. For example, my 77 weighed 4800lbs. You can't tell me it didn't have a GVW of less than 6000lbs. I went looking for the title but all I could find is the RPO sticker. Perhaps I threw the title away after I torched the truck. hmm.
     

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