Chrysler "C" Body HP Exhuast manifolds

Discussion in 'General Motoring' started by RM, Jun 22, 2004.

  1. RM

    RM Guest

    I'd like to keep the stock look of cast iron manifolds, but add a bit of
    performance to my 1963 413CID. What engine donors would have the HP exhaust
    manifolds and would be a bolt on replacement? Casting numbers would be much
    appreciated :)

    RM, Jun 22, 2004
  2. There's no reason to change manifolds. If you feel your present exhaust is
    overly restrictive, put in a system of duals all the way back, of
    thoughtfully-selected pipe diameter, and with a balance pipe between the
    two sides.

    Daniel J. Stern, Jun 23, 2004
  3. RM

    RM Guest

    I already have duals all the way back, 2.25" pipes, however I do not have an
    'X' or 'H' crossover. Honestly, it's not that I feel that they are too
    restrictive at this point, but I plan on some mild performance and
    reliability upgrades, and figured while I was at it....

    Bad move?

    RM, Jun 23, 2004
  4. That is *PLENTY*, you don't need to spend money on new manifolds (and the
    HP manifolds do cost a great deal of money). Just add a crossover. "H" is
    fine, there's no need for "X". You can find all kinds of web tutorials on
    how to figure out the most advantageous place to put the crossover pipe in

    This'll leave you with more time and money to spend on things that'll
    actually make a cost-effective difference while driving the car.

    In the interest of blatant, shameless self-promotional interest, I'll
    suggest you hit my website and think about your car's lighting system.

    Daniel J. Stern, Jun 23, 2004
  5. RM

    RM Guest

    I definitely will!


    RM, Jun 23, 2004
  6. RM

    Steve Guest

    I disagree with Dan on that one- there's a pretty substantial difference
    between HP cast iron manifolds and the restrictive "log" type standard
    manifolds- especially on an engine bigger than a 383. Getting an HP
    manifold that is a true "bolt-on" replacement is impossible, though,
    because the flange on the HP manifold is different (wider bolt spacing,
    larger opening, bolt holes may be indexed at a different angle). Any 383
    or 440-powered C-body that had HP manifolds (TNT, Magnum, or Super
    Commando engine package) will make a good donor, and the manifolds will
    bolt right up to the heads just fine. Its just the exhaust down-pipes
    that will have to be changed.
    Steve, Jun 23, 2004
  7. Oh, I misread his intention -- thought he wanted to hunt up the
    scarce many-hundreds-of-dollars-apiece items from a '60-'62 crossram setup
    as found in e.g. the letter cars.

    RM, listen to Steve, he's done more manifold swaps on big blocks than I

    Daniel J. Stern, Jun 23, 2004
  8. RM

    RM Guest

    Cool....Problem is, there seems to be an abundance of "B" body manifolds and
    few "C" bodies. But I'll continue to look.

    Thanks Steve and Daniel

    RM, Jun 23, 2004
  9. RM

    Steve Guest

    Hmmm... I didn't even register that as a possibility since those are
    made of unobtanium (nearly). At any rate, a swap to the late-60s vintage
    C-body HP manifolds is not really expensive (maybe $40 to $60 per
    manifold plus the work to change the flanges on the exhaust system) and
    has more benefit for a nearly-stock engine than headers do but without
    all the leaks and fitting required for headers. Any more than a
    slightly-warmed stock engine, though, and headers win performance-wise.

    Oh, and Dan's right about the crossover pipe (aka H-pipe or balance
    pipe) between the sides of the dual exhaust. That gives a pretty big
    boost to low-end torque.
    Steve, Jun 23, 2004
  10. Head pipes, i.e., in front of the mufflers, need to be a minimum of 2.5".
    Richard Ehrenberg, Jun 24, 2004
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