Advance cam or not?

Magnum Engine Swaps

  1. Freezerman

    Freezerman Well-Known Member

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    I am putting together a 5.9 magnum for my Dart. Stock bottom end with EQ heads and Hughes springs. Doug's headers. It will have 9.25 compression, I have an Oregon cam 1357 to put in. I degreed it as installed at 108. I am wondering if I should install it advance 4 degrees? It has 26" tires, 3.73 gear, 904 transmission with 2800 stall. Thanks.
     
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    • RustyRatRod

      RustyRatRod Weenie idiot loser. FABO Gold Member

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      If you installed it at 108, it already is advanced 4*.
       
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      • Freezerman

        Freezerman Well-Known Member

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        Yes. As you know RRR, the cam in my 360 improved quite a bit on your advice to advance it an extra 4 degrees. I just don't want to put this one together and then find out I should have pushed this one ahead also.
         
      • 64mopar

        64mopar Well-Known Member

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        I would go at least 2.
         
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        • RustyRatRod

          RustyRatRod Weenie idiot loser. FABO Gold Member

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          If the compression is MEASURED and ACCURATE.......I would stab it in right where the card says, because that match is "about right".
           
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          • Freezerman

            Freezerman Well-Known Member

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            Yes, the compression is measured with 62cc heads. I used 3 different calculators and all were within .1 of each other. Thank you.
             
          • RustyRatRod

            RustyRatRod Weenie idiot loser. FABO Gold Member

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            Then I would put that bad boy in per the cam card and have fun! Extra advance is needed when the cam is a poorer match. in other words, when the cam is "too big" for a given static compression ratio, you advance it more to help cylinder pressure. In your case, you won't need to.
             
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            • JoePole1

              JoePole1 A dude in a B body FABO Gold Member

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              Mr Freeze. Please let us know how your build performs. I am doing similar and and starting my cam selection. Would appreciate real world feedback on that and any other cams. Thank you.
               
            • Freezerman

              Freezerman Well-Known Member

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              I will. It won't be for a few months though. After winter in Minnesota.
               
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              • Oldiron440

                Oldiron440 Well-Known Member

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                I like putting in 2° just for chain stretch if using a new timing chain, but that's me.
                 
              • RustyRatRod

                RustyRatRod Weenie idiot loser. FABO Gold Member

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                That's probably not a terrible idea.......what I would do is use a compression gauge in conjunction with the degree wheel. Once degreed, spin the engine over and take a compression reading. If you think it's a "little low" you can bump in the extra 2*. At least "like that" you'll kinda actually know "where" you are.
                 
              • Oldiron440

                Oldiron440 Well-Known Member

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                I've been doing it for 35 years, I pull my junk back down for a refresh after 200 + - pass's and even the good chains are stretched.
                 
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