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  • Users: Davison
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  1. D

    1972 440-4 Difficult start after not being driven for several weeks

    I have a 1972 Road Runner GTX that runs great, except when it sits for longer than a day or two. It is a well-kept original car, original carburetor, the engine and trans have never been opened, etc., less than 30,000 miles. The last time the carburetor was rebuilt was in 2018, and the fuel...
  2. D

    1972 Road Runner fuel pump spec's

    A few years ago I installed a Delphi fuel pump for my 440-4bbl. It runs fine. No issues on how I drive it-mostly for causal drives or to car shows a few times a month. 60 mph tops. I brought the car in for it's annual checkup and the mechanic said he thought the pump pressure at 4.4 psi was too...
  3. D

    1972 440 valley tray insulation

    On the '72 Road Runner 440-4: I have been told that I am missing the heat/sound insulation between the valley tray and the intake manifold. It is supposed to be a fiberglass and aluminum insulation that fits between both. Is this correct and does anyone make/have this art? I can't seem to find...
  4. D

    1972 Road Runner 440-4 Spark Plugs

    What's your opinions of the Champion RJ 12YC plugs as compared with the NGK BR6S. The Champions are in the car now and AutoZone does not have those only the NGK. Any opions or another plug. No racing, just starting, driving and cruising. Thanks.
  5. D

    White sidewall tires

    1972 Road Runner came standard with whitewall tires. Does anyone know the whitewall width? In the early to mid 1960's the tire industry width went from 1" to 7/8" to 5/8" (in general.) But what was it in the early 1970's? I'd like to come as close as possible to a correct looking tire for my...
  6. D

    Black soot on ground at start up

    1972 440-4 automatic: For a cold start, I press the accelerator once to the floor, turn the key and the car starts right up. However at the exhaust, there's black soot on the garage floor. This soot does not happen on a warm start, nor is there any soot coming out of the exhaust when the car...
  7. D

    Coolant pukes out of overflow tube after shut off

    1972 Road Runner 440: Had been running perfectly in 75-90 degree temperatures. No issues. Oil pressure right in the middle of the gauge, water temperature in the middle to slightly to the left, cool side. No problems of temperature gauge going to the hot side at stop signs or traffic lights...
  8. D

    '72 GTX Under hood Pad

    Was there an under hood insulation pad attached to the underside of the '72 GTX hood? Mine seems to have holes for one, but then again, maybe all hoods had the holes to make it easier for the stamping plant.
  9. D

    1972 Road Runner GTX 440 dual exhaust with tips

    As the title says, that is the car I have. The car is pretty much a survivor, meaning not restored, not modified that I can tell, but as things wore out they were replaced over the years. I am trying to replace the aftermarket parts that are not correct. The exhaust is a replacement system and...
  10. D

    '72 440 Fuel Pump

    The original fuel pump in my 1972 Road Runner GTX 440-4bbl has died. Since the car is 90+ original, I would like to know if anyone rebuilds fuel pumps. If not, what is a good choice that functions and looks like the original pump. The stock pump specification is only 3.5 to 5psi. Any...
  11. D

    Fuel used for High Performance 440

    I have not driven my 1972 Road Runner in 10 years. I have drained and cleaned the fuel tank and lines and will start on the carb. After I get everything back I want to use the best fuel possible. I know in 1972 it was just the start of the low-lead and un-leaded fuel. The service manual says...
  12. D

    Sulfurized Ester and Motor Oil Choice

    I have a 72 Road Runner GTX 440-4bbl that I am "waking up" after about 10 years of non-use. Going through the owners manual and the service manual it says to add a pint of sulfurized ester to the motor oil. I never heard of this product. It was sold by Mopar as a high performance additive at...
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