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Catalytic converters: does your square have them?

Discussion in 'Engine & Performance' started by gotyourgoat, Jan 24, 2020.

Does your square have a catalytic converter?

  1. yes

  2. no

  3. yes, but only because I couldn't get a sticker/plate without them.

  4. no, but only because I'm too lazy/cheap to change what the previous owner did.

  5. no, because my truck didn't come with them.

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  1. Keith Seymore

    Keith Seymore Full Access Member

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    Location:
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    First Name:
    Keith Seymore
    Truck Year:
    1987
    Truck Model:
    R10
    Engine Size:
    4.3L
    I can confirm that our '75 1/2 ton swb pickup had a catalytic convertor. It blew the bottom out during a long decel on a freeway off ramp, scattering the pellets across the roadway.

    It was a bit dicey for a few seconds until we cleared the debris field.

    K
     
    Last edited: Jan 27, 2020
    Poppy 87 and legopnuematic like this.
  2. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Being a 3500 most likely no cats
     
  3. TPISly-C10

    TPISly-C10 Full Access Member

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    Joined:
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    Location:
    Boucherville QC Canada
    First Name:
    Sly
    Truck Year:
    1986
    Truck Model:
    C-10 shortbox
    Engine Size:
    LQ4 6.0L
    originaly 6.2 diesel so not cat there...no cat here! :)

    _DSC3664.jpg
     
  4. Craig 85

    Craig 85 Full Access Member

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    Truck Year:
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    Truck Model:
    K30 SRW
    Engine Size:
    454/TH-400/NP205
    Your truck never came with them. My K30 is the same set up as yours with California emissions and it never ran cats. Check your fuel fillers. They should be the larger style for regular fuel, not the small unleaded style. Also, the gas gauge should NOT say Unleaded Fuel Only.
     
  5. K5ride

    K5ride Junior Member

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    Joined:
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    Location:
    Apple Valley, CA
    First Name:
    Steve
    Truck Year:
    1975
    Truck Model:
    C10 Stepside
    Engine Size:
    350
    My 75 Stepside came with single exhaust with catalytic converter. California does not smog 75 and older so I replaced it with dual exhaust / no cats.
     
  6. Goldie Driver

    Goldie Driver Full Access Member

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    Engine Size:
    350
    I was flying by memory, but this seems to confirm it for Texas :

    https://www.emissions.org/loc/texas-emissions-testing/

    Aged based only.

    Antique plates have a 2K per year mileage limit- dunno if they check - but IIRC only requires inspection once every 5 years.

    Classic plates don't offer that, but the safety inspection is only 7 bux and I can drive it as much as I can afford gas for it.:anitoof:
     
    80BrownK10 and DoubleDingo like this.
  7. 78C10BigTen

    78C10BigTen Full Access Member

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    Truck Model:
    C10 BIG TEN
    Engine Size:
    350
    My (catless) true duals have been on my truck uninterupted for about 4 years driven daily.and are still in great shape.
     
  8. SirRobyn0

    SirRobyn0 Full Access Member

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    First Name:
    Rob
    Truck Year:
    1984
    Truck Model:
    C20
    Engine Size:
    350
    My 84 was a Portland, Oregon truck from when it was bought new until I got it. I don't have emission testing, but Portland tests 1976 and newer. My truck is setup exactly like yours except the pellet cat was replaced by a modern honey comb cat at some point and has duel outlets but on the drivers side. I did not realize the dual outlet muffler was factory.
     
  9. Kim Burke

    Kim Burke Supporting Member Supporting Member

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    Location:
    Mesa, AZ
    First Name:
    Kim
    Truck Year:
    1979
    Truck Model:
    C1500
    Engine Size:
    454
    Mine had all the stock exhaust intact including two cats and x pipe. Built in Norwood assumed it was a CA spec’d truck. I wish I’d taken pics before removal. This is the only exhaust pic I’ve got. 841024B0-83CD-4309-A26B-A6251FD8A49B.jpeg
     
  10. drware

    drware Junior Member

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    Location:
    Cleveland Tn.
    First Name:
    Donnie
    Truck Year:
    1986
    Truck Model:
    K30 Silverado
    Engine Size:
    454
    My 86 K30 got it new had the little factory headers without cats the pipes had heat shields around the pipes back to mufflers Replaced mufflers 10 years ago but pipes still good. Still drive it every day. Got down now having it painted now
     
  11. discuspro

    discuspro Junior Member

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    Location:
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    First Name:
    Dustin
    Truck Year:
    1981
    Truck Model:
    C10 shortbed
    Engine Size:
    305
    So, Austin (williamson cnty) can be tricky it seems. I am in the process of getting my 81 C10 inspectable and no cats (current status) got me wondering... Also, I don't have the stock air cleaner, no EGR, long tube headers, no TVS. I've had people say if they look under the hood they are taking you for a ride and I should be fine... but I am not resting easy yet...
     
    Last edited: Jan 28, 2020
  12. donnieray

    donnieray Talks to dogs and trucks. Supporting Member

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    Engine Size:
    350,355;350.
    I live in a NC county that don't do emissions inspections but if cats were standard on your junk then they do a visual. Most towns have places that uh, don't notice if they are missing. I have true duals and dynaflows or magnaflows on my stuff. My daughter lives in a NC county that smog checks everything from 1990 up. Also cool about NC is anything 35 years or older don't have to be inspected!
     
  13. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Truck Year:
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    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    I remember when I used to have my 65 smogged every 2 years. Was glad when they changed that rule
     
  14. John-Ryan

    John-Ryan Junior Member

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    Right on the money! Took ours in for an inspection and was pleasantly surprised at the $7 inspection. Caught the mechanics drooling over it and they told me to check back in when I do some work on it.
     
  15. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    When I take in my '81 C20, the guy that owns the smog testing station always comments on the truck. He tells me every time to hold on to it because they are rare to see and easier to pass emissions.
     
    John-Ryan and 80BrownK10 like this.

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