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383 and emissions??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Sep 9, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    Ok, I've got a 90 350 TBI and we have sniffer check and visual for the cat only. What would I need to do to keep it sniffer friendly and keep my TBI stuff and all. I was thinking about getting the mighty mouse kit or pre-assembled block from Speed-o-motive.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  2. jarheadk5

    jarheadk5 1/2 ton status

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    I would think that if you install all the emissions gear (good-quality cat, AIR pump, EGR, etc.) from the 350, ensure any aftermarket parts outside the engine (intake manifold, headers, etc) have CARB numbers, and stay semi-calm on the cam specs, you should be OK. It's not like they can mike your bore &amp; stroke...

    It's a happy day in Marine Aircraft Group 49... 405 is ALIVE!!
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  3. CrazeeBush

    CrazeeBush 1/2 ton status

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    Hey B,
    As long as you take it easy on the cam, you should be fine. A 383 aint gonna put out much more than the 350. Hell, you could prob lose the air puimp and just leave the cats on. Do I hear Headers? lol anyway, time for class. I'm gonna try to stop by one weekend soon and see this monster. I seen ya driving down the road the other day. Later



    -BuSH
    '83 K5 Blazer
    '98 Monte Carlo z34
     
  4. ftn96

    ftn96 1/2 ton status

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    So basically what Im gathering here is that the cam will most likely be the culprit to effect the emissions output?
    Well thats cool, cause I wont really need a radical cam to produce torque if bottom end is already going to be giving me all the torque I need.
    This is all down the road stuff. Just starting my research.
    Keep the info coming.

    Bush....Dont ever get to see you butt since you started back to school. [​IMG]

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  5. Burt4x4

    Burt4x4 3/4 ton status

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    You can just send that short block to me and I'll put it in my smog exempt K5! Problem solved!! hehehe
    Some day I too will be running a 383..............some day!!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  6. ftn96

    ftn96 1/2 ton status

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    LOL!!!! Wake up man your having another one of those wet dreams. Your getting that $%&amp;^ everywhere.[​IMG]

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  7. jarheadk5

    jarheadk5 1/2 ton status

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    Yep, everything I've read says the cam is the showstopper when it comes to smog-legal performance. But like you said, you shouldn't need a wild cam with a 383...
    If you have a visual inspection, you definitely need to keep ALL the external emissions crap in place, and make sure it all works correctly (at least at inspection time [​IMG][​IMG][​IMG]). If stuff's missing, that gives an inspector a reason to dig deeper.

    It's a happy day in Marine Aircraft Group 49... 405 is ALIVE!!
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  8. ftn96

    ftn96 1/2 ton status

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    The only thing we have here is a snif check and they check to see if you have a CAT

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Cam and COMPRESSION can hurt you. Not sure HOW effective a cat is at removing NOx, but the higher the higher the compression (combustion temp) the higher the NOx readings tend to be. Obviously there are ways around this, as new vehicles are running upwards of 9.5:1 again, but without going premium on the gas, thats the typical limit of 87 octane.

    I looked into the cam choice when I was looking for a roller cam, and the smallest one they offered actually fit the bill better, because the curve was lower in the RPM band, which is where *I* need it, both for low RPM usage and MPG.
    http://www.dorianyeager.com/index2.html
    No anti-theft measures on your truck? No pity when its stolen
     

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