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  1. magnumdart

    Anyone running catalytic converters on car with flat tappet cam?

    I don't know how much zinc it takes to ruin a converter, but all sorts of vehicles are running oils with additional zinc. How much oil do you think is going to go through the converter? Why would the cam make a difference?
  2. magnumdart

    Is exhaust back pressure the culprit here?

    You will be at this for a while if you don't get a plan. There are many easy checks you should start with. Fuel filter, fuel pump, maybe a wire going to ground intermitently, damaged plug wire, maybe while the anti sway bar and pipes were being banged around back there the fuel line got damaged...
  3. magnumdart

    Muffler sound

    Go early to a car show and listen to them as they rumble in to register. Make note of what you like, then ask them what they are running.
  4. magnumdart

    Muffler sound

    Why worry about the sound? Put it together so it will last a long time, and give you the best power. At 5000 rpm you may not be able to hear the difference. My small block has hp manifolds, two inch stainless pipes, no H-pipe, and flowmasters. Rumbles just fine.
  5. magnumdart

    Ever had this happen? (pics)

    Used to do the shut off and coast in gear thing also. My Thrush mufflers were basically two hollow cans with the bottoms out of them, bolted to the header flanges.
  6. magnumdart

    00 Chrysler Concorde whistling sound.. Egr? Exhaust leak?

    That thing is making a lot of noise. Do you have a stethoscope? You will find it easy if you use one for that noise. It'll blow your ears out.
  7. magnumdart

    00 Chrysler Concorde whistling sound.. Egr? Exhaust leak?

    This could be the alternator going bad. Did it get soaked in anti-freeze?
  8. magnumdart

    Sidepipes or not?

    Not a huge fan of them but they did look good on old Rivieras.
  9. magnumdart

    74 dart v8 automatic

    I was gonna suggest flowmasters myself. Always had good luck with them. As far as the rest of the build, just get the manual or a small block Chrysler engine manual and follow it step by step. Use quality bearings, rings, gaskets, etc. Have a machine shop clean up the block and hone it for...
  10. magnumdart

    74 dart v8 automatic

    Not sure what sort of bang you're looking for. Mine has stainless pipes...they might last forever depending on use.
  11. magnumdart

    exhaust drone/harmonic resonance

    I put Walkers on my RR and it purred like a kitten...til I stood on it.
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