Dougs D452 vs D451

Mopar Exhaust Systems

  1. greenmachine

    greenmachine Well-Known Member

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    Hi all
    Can I bolt my D452 headers to a 400 B motor. They are coming off a 440 RB.
    The site calls for a D451 for a 400.
    Thanks. Erik.
     
  2. 68Moparmaniac

    68Moparmaniac Well-Known Member

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    No
     
  3. greenmachine

    greenmachine Well-Known Member

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    Dammit. I found a good 451 stroker but I can’t afford another pair of dougs with 800 all in. Thanks for info.
     
  4. 65-440

    65-440 Well-Known Member

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    Yes you can, they will just hang a tad lower. I have TTI headers on my 383 that came off a 440 ... I think the deck height is 7/8" difference, I think ! B and RB heads are the same ... now whether those headers fit your car or not is a different story
     
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    • 65-440

      65-440 Well-Known Member

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      See .... and this setup has been in the car running for over 2yrs now

      20161008_155413.jpg
       
    • 33 IMP

      33 IMP FBBO Gold Member FBBO Gold Member

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      Shorter deck height of a b motor, around 3/4", will make the headers hang lower, and closer together, in the car. If your headers are still in the car maybe you can look to see if it looks like they will get closer to something below where they are now. Plus, there is nothing sacred about header tubes. They can be "adjusted" for fit, it's done all the time.
      I'm sure the dougs intended for a low deck will fit better than the tall deck, but i sure wouldn't pass up a good deal on a stroker, cause i might have to "adjust" the headers.
       
    • greenmachine

      greenmachine Well-Known Member

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      Damn good point.
       
    • cryplydog

      cryplydog FBBO Gold Member FBBO Gold Member

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      Is the tubing dia. any different from the 1's to the 2's?
       
    • greenmachine

      greenmachine Well-Known Member

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      I believe 451s are - 1” and 7/8. Vs 2” on the d452.
       
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      • 33 IMP

        33 IMP FBBO Gold Member FBBO Gold Member

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        The 2" pipes would be fine on a stroker b. I've got ancient 2"hooker adjustable (not hammer adjustable, tubing length adjustable, lol) on my 440,would work equally well on a 451. Heck, I've got 2" headers with 3 1/2 tubing and mufflers on my 408 small block. I did have to "adjust" those.
         
      • 67MPRFAN

        67MPRFAN Well-Known Member

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        Did you get the headers installed on the engine yet
         
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