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Thread: F-Body vs. truck ex-manifold dimensions

  1. #1
    Join Date
    Jan 2005
    Posts
    26
    Hi Guys,
    I'm putting a 2001 LR4 truck engine in a 46 chev truck and the exhaust manifolds seem to make the whole package too wide. The flanges are too wide for my frame rails by approx 2 inches. Are the F-body manifolds tighter to the engine?
    There is only so much I can do with a welder before this starts to look really cheezey.
    Thanks for any info. - Mike V
    <HTTP://www.enzoco.com/mike/truck/>

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    If you can get me the dimensions I can measure mine and tell you if mine are different. I have a F-body engine I am building right now with stock cast iron exhaust. Be sure to detail how and where you&#39;re measuring.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
    Posts
    2,462
    C5 ones are pretty tight against the block from my memory.
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  4. #4
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    yeah, the C5s are tight against the block but they exit near the center of the engine, not the rear.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
    Posts
    2,462
    That&#39;s what I recalled, they&#39;re almost like a "Block-Hugger" style header. Many street rods I&#39;ve seen use a header similar to that but if they clear it could be an option... plus the flow just as well as mid length headers do.
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  6. #6
    Join Date
    Jan 2005
    Posts
    26
    Thanks guys,. Red Heartbeat, you prompted me to start looking at ebay pictures when I walked out in the garage with my camera, and couldn&#39;t find a darn tape measure. I guess it&#39;s time to clean. LOL. F-body manifolds look like the sh*t for me. Much tighter to the engine than the rtuck units.
    MV

  7. #7
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Send me your email addy and I&#39;ll send you some pics of my exhaust manifold setup so you&#39;ll have some idea of the f-body setup.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  8. #8
    Join Date
    Apr 2005
    Location
    springfield MO
    Posts
    226
    I was able to squeeze the z06 manifolds in my conversion with the 5.3. there was an article in Chevy highr performance or Car Craft that tested the different manifolds based off dyno power. The C5 ones were neck and neck with the headers they tested. That convinced me to go that route, and yes they do look like the block hugger headers.
    Dave
    1968 Chevy SWB Fleet. 2002 5.3 all stock (for now ) Nelson Tune 4l60e w/TB converter.
    ok not stock anymore...13.3 at 101
    Now with front mount turbo... new times soon

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