HP exhaust manifold verses Header comparison

Mopar Exhaust Systems

  1. Aeronet

    Aeronet Well-Known Member

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    Yes, they cook the lower part of the gasket and then they leak. I've tried hi-temp silicone, heavy duty/hi-temp gaskets and after a while the lower part is turned to coke.
    Just a minor pain in the ass.
     
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    • Robert Schaad

      Robert Schaad Well-Known Member

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      Agree 100 percent. Im 69 and have driven HP mopars brand new. They were sick. Loved the power. Mopar designed the HP Exhaust manifolds to give max horse power from stock engines. Adding headers did little if nothing. But any time you change from stock you may need better breathing. My opinion is: It is your car, do what you want. You are not wrong for anything you do. Some love headers, some do not. I build stock motors and do not like headers.
       
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      • mopar 3 B

        mopar 3 B Well-Known Member

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        Think I went to cork and rubber on the last set of valve cover gaskets. Never had a problem with deuteration in 160000 leak free miles with HP manifolds.
         
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        • Aeronet

          Aeronet Well-Known Member

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          What brand?
           
        • mopar 3 B

          mopar 3 B Well-Known Member

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          I think Felpro
           
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          • Aeronet

            Aeronet Well-Known Member

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            What camshaft is in your car. "Street Hemi" in mine. Also a '73 Charger. It gets hot in that engine compartment.
             
          • mopar 3 B

            mopar 3 B Well-Known Member

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            Its a Hemi grind Crane in a BB.
             
          • strokie

            strokie Well-Known Member

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            • Robert Schaad

              Robert Schaad Well-Known Member

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              So you mildly built a 383 and it dusted off a STOCK 383. Most every thing I say is about STOCK and have also stated that when building an engine Headers may be better. Why does everyone not see my words STOCK?
               
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              • mopar 3 B

                mopar 3 B Well-Known Member

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                Because " stock " is not a recognizable term. Now if one was doing a connoisseur to original engine build everyone would know what it was.
                 
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                • Cranky

                  Cranky Banned Staff Member FBBO Gold Member

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                  My engine was so mild that most would have considered it stock......and pretty much was except for headers and a different carb. It even idled like a stock engine. So, define STOCK. Yup, headers and a non stock carb made it different than stock....at least at the drag strip it did but even having a different size tire on the back put it into a different class. :bananaweed:
                   
                • Dennis H

                  Dennis H FBBO Gold Member FBBO Gold Member

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                  Jesus Chrysler. Who dug up this thread. Put Headers on it and be happy with the cooler temps and weight reduction. Stock schmock.
                   
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                  • Budnicks

                    Budnicks You Can Just Thank Me Later FBBO Gold Member

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                  • Bee1971

                    Bee1971 Well-Known Member

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                    • BSB67

                      BSB67 FBBO Gold Member FBBO Gold Member

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                      What were the cam specs? Compression ratio? And head flow? Also wonder what the exhaust system after the header and manifolds looks like.
                       
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                      • Turboomni

                        Turboomni Well-Known Member

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                        Could it be that the cam specs favored the upper rpm's where the cast manifolds wouldn't have a chance?
                         
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                        • 65Fury440

                          65Fury440 Well-Known Member

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                          Wait..... are we talking stock here?:)
                           
                        • Pete Bell68

                          Pete Bell68 FBBO Gold Member FBBO Gold Member

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                          I've had cars with both and really just depends on what you like with performance and sound .
                          I'm running manifolds because this car is all stock .
                           
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