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    Results 1 to 11 of 11
    1. #1
      Join Date
      Sep 2005
      Location
      Scottsdale AZ
      Posts
      324

      LS3 sheet metal intake noise help needed

      I have a GM480 hp crate motor with a Fitech sheet metal intake. The noise from the thin sheet metal intake drives me nuts. Has anyone successfully dampened it with Dynamat underneath the belly of the intake or by maybe welding some support ribs across the top?

    2. #2
      Join Date
      Sep 2010
      Location
      Beach Park IL
      Posts
      2,856
      Country Flag: United States
      What noise? What does it sound like?
      Donny

      Support your local hot rod shop!

    3. #3
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,516
      Country Flag: United States
      It’s a known problem with the cheap sheet metal intakes. I think it might be a little too hot for Dynamat.
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    4. #4
      Join Date
      Jul 2008
      Posts
      459
      Country Flag: United States
      When is the noise noticeable? Idle, cruise, wot?

      What about spray on sound deadener or getting a truck place to spray on bed liner, it would thicken the support structure, provide a small amount of insulation, and hopefully dampen the sound.

      https://www.amazon.com/Design-Engine.../dp/B001URKV0G
      *Jeff*
      Project Salty - 1964 4 door Malibu, beaten, neglected, red headed foster child
      Cammed LQ4 / T56 Swap Project Thread <-click to read! 😁

    5. #5
      Join Date
      Sep 2010
      Location
      Beach Park IL
      Posts
      2,856
      Country Flag: United States
      Quote Originally Posted by dontlifttoshift View Post
      What noise? What does it sound like?
      I tried one of these for awhile, I don't recall any weird noises. Can some one explain it?
      Donny

      Support your local hot rod shop!

    6. #6
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,516
      Country Flag: United States
      Quote Originally Posted by dontlifttoshift View Post
      I tried one of these for awhile, I don't recall any weird noises. Can some one explain it?
      It’s just loud tinny valve train noise imo. Worse with high lift cams.
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    7. #7
      Join Date
      Sep 2010
      Location
      Beach Park IL
      Posts
      2,856
      Country Flag: United States
      Thank you.

      Almost every factory intake will make more and better power on that engine and will be quieter for sure.
      Donny

      Support your local hot rod shop!

    8. #8
      Join Date
      Sep 2008
      Location
      Jacksonville, Florida
      Posts
      630
      Country Flag: United States
      Gen 3 Hemi's use a pretty thick foam block in the dry valley under the intake. Works well for dampening valve train noise. Most OE's use the same type of foam block under the plenum if it overhangs the valve cover on overhead cam engines. It will be between the valve cover and plenum to dampen noise. You could make a pick and pull trip and grab an OE insulator, you know it has been engineered to be the right density and heat resistant.
      Craig Scholl
      CJD Automotive, LLC
      Jacksonville, Florida
      904-400-1802
      www.cjdautomotive.com

      "I own a Mopar, I already know it won't be in stock, won't ship tomorrow, and won't fit without modification."

    9. #9
      Join Date
      Sep 2005
      Location
      Scottsdale AZ
      Posts
      324
      Thanks for the input. All great ideas.

    10. #10
      Join Date
      Oct 2004
      Posts
      2,552
      Country Flag: United States
      Muffler wrap would be heat resistant enough and is designed to dampen muffler resonance.
      Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."

    11. #11
      Join Date
      Sep 2005
      Location
      Scottsdale AZ
      Posts
      324
      So far I am leaning towards coating the top with Lizzard Skin. It would have a nice texture and muffle the sound. Plan B is to suck it up and buy a new intake for Texas Speed or Holley.







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