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Hot air stovepipe thing on passenger side...

Discussion in 'The Garage' started by dremu, Nov 20, 2006.

  1. dremu

    dremu Officious Thread Derailer Premium Member

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    exhaust manifold. 1974 big block (though my SBC of the same vintage also has it.) What's it do, how's it work?

    The tin around the exhaust manifold is, well, falling off something fierce ... I could fix it, or I could just remove all of it (no smog on this old a truck) if it doesn't do much.

    Is it only for cold starts, or ...? Never gets below freezing here in California at sea level, so I donno how much good it's doing, blowing hot air into the intake, right?

    -- A
     
  2. sandawgk5

    sandawgk5 3/4 ton status

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    It takes warm air off of the manifold for the engine. there is a flapper inside the snorkle of the air cleaner that when cold pulls air from the manifold and when warm it pulls it through the snorkle deal. Depending on the year of your vehicle (i.e for smog) you have to have that or it will fail visual.

    Ira
     
  3. prerunner1982

    prerunner1982 1/2 ton status

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    sandawgk5 beat me to it...
     
  4. vortec

    vortec 1/2 ton status

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    mine crumbled off of the k5 about a week after i bought it. never replaced it. and i've been driving my pickup around for most of a decade without one. never had a driveablility or inspection issue because of it. they are getting tight on emissions, here in dfw, but i'm sure it's still much tighter in california.
     
  5. 79k20350

    79k20350 3/4 ton status

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    Being that you are in cali and its pre smog id ditch it.
     
  6. dremu

    dremu Officious Thread Derailer Premium Member

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    Yup, through '75 is smog exempt, so I don't need it for that ... only question is does it do anything useful, i.e. should I fix/replace the tin, leave the pipe hanging down off the aircleaner (maybe hoseclamp it in place?) or don't even bother with the downpipe?

    -- A
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I wouldn't worry about it, brother. It's only a necessity in areas where there's a possibility of low temperatures and humidity that together can cause your carb to ice up during a cold start. It *may* help your motor warm up a wee bit faster, but other than that it serves no real purpose in your neck of the woods.
     
  8. dremu

    dremu Officious Thread Derailer Premium Member

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    Cool; thanks. One less thing I gotta deal with during the motor swap.

    -- A
     
  9. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    I replaced mine...like $2 for the little slinky pipe thingy at the parts store...and yeah on really cold mornings around here it helps it warm up faster but it's not like you really need it for that.
    It will fail the visual inspection around here if you don't have it though.

    -Avery
     

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