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  1. #1

    Default Seafoaming My 4.3L

    Tomorrow I am going to seafoam my '05 Silverado 4.3 v6.

    I need help locating the vacuum line that will spread it to all cylinders. IF someone could point me in the right direction, i'd appreciate it.

  2. #2
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    Most of the posters here use the brake booster hose. They disconnect it from the booster end so they have the 2 1/2 foot section of hose & is easy to use.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3


    Look on Seafoams website and they show how to spray into the intake throttlebody, this will get the intake manifold and ALL the cylinders clean.

  4. #4


    Any vacuum hose will distribute the SF to all cylinders. I prefer to pour it down the IAC port in the throttle body, or simply on the throttle plate. Sucking the SF through the small ports seems to atomize it better.
    When you hear hoofbeats, look for horses not zebras.

  5. #5


    I think on Seafoams website they don't recommend pouring in down the IAC port.

  6. #6


    I sent it down the throttle body right over the plate while a buddy laid on the gas a little. Let it sit and it smoked awhile. Now it runs like it use to, 90,000 miles ago. Love SeaFoam!

  7. #7


    Run a tankful with Seafoam just before your next oil change, it will clean any junk/water thats in the fuel system.

  8. #8


    Seafoams the greatest!!! Silveradoguy87 I'm trying to start a V6 group to share tips etc. Check out the groups section. Hope to get some pics soon.
    1998 K1500 Ext. Cab 4.3 5spd
    Amsoil, CIA

    2007 Harley Davidson Vrod
    Amsoil, Vance & Hines 2into1, K&N Topless,
    Screamin Eagle Racetuner, StageII cams,
    Carbon fiber front fender, and a few more lil goodies:wink:

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