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  1. MOPAR487

    340 demon overheating problem

    i HAVE A 340 DEMON WITH A BUILT 340/450 HP 12.5 TO 1 COMPRESSION. aM RUNNING STOCK RADIATOR W ELECTRIC FAN, hAVE IN ITV NOW A165 DEGREE THERMOSTAT. tHEC CAR WILL RUN 220 DEGREES ON A 60 DEGREE DAY. THINKING ABOUT ADDING A FLEXOLITE OR CLUTH FAN TO ASSIST IN COOLING THE CAR. THE ELECTRIC FAN IS...
  2. MOPAR487

    71 demon prostreet

    Merry Xmas, trying to load more pics.
  3. MOPAR487

    71 demon prostreet

    having trouble loading more pics.
  4. MOPAR487

    71 demon prostreet

    Its got a 340 bored 60 over, ultradyne custom ground cam, ported,polished heads gasket matched heads, everything balanced, approx 12.5 to 1 comp. Runs best on 100 plus gas, Rich Thomas built motor, from ST. Louis, Mo. Will try to post more pics. Thinking about trading for a more street friendly...
  5. MOPAR487

    71 demon prostreet

    71 demon 340/450hp 727w/4000stall/488gear. coilovers w/ladderbars. custom dash. sublime color m/t tires with centerline super stock wheels. Ive been trying to post pics, havent had much luck ,will try again.
  6. MOPAR487

    340 Demon

    The only reason I used 91 octane was I was moving the car from my garage to storage for the winter. (couldnt find any racing fuel) Wife wanted the garage back for the winter. I normally run 100 octane in it. Was told it has that high comp. when I bought the car. Dont know for sure. Thanks for...
  7. MOPAR487

    340 Demon

    .got a built 340 in a 71 Demon, it has about 13.5 to 1 compression ratio, if I run 91 octane fuel in it, it seems to run hot (210 deg.) on a 60 degree day, Ive got a 160 degree high per. thermostat in it. Electric fan w? stock radiator. Will running that low octane fuel in this motor make it run...
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