340 cam selection....

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    Author Topic: 340 cam selection....  (Read 2932 times)

    Offline HemiOrange70

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    340 cam selection....
    « on: May 31, 2007 - 09:34:25 AM »
    Have a chance to get a Crane cam at a good price.
    First is everyone happy with crane cams???
    I want my 70-340 to be close to stock here are the specs.


    Part Number: 150052 Grind Number: 272 H10
    Engine Identification:     
    Start Yr. End Yr. Make Cyl Description
    1964 Up PLYMOUTH-DODGE-CHRYSLER 8 GOOD IDLE, DAILY USAGE, OFF ROAD, HIGHWAY TOWING, FUEL EFFICIENCY PLUS PERFORMANCE, 2600-3000 CRUISE RPM, 8.75 TO 10.0 COMPRESSION RATIO ADVISED. BASIC RPM 2000-5000
    Engine Size Configuration   
    273-360 C.I. V   
     
    Valve Setting: Intake .000 Exhaust .000 HOT
     
    Lift: Intake @Cam 3027 @Valve 454 All Lifts are based
    on zero lash and theoretical rocker arm ratios.
      Exhaust @ Cam 3027 @Valve 454
    Rocker Arm Ratio 1.5   
     
    Good choice or not????
    Thanks
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    Offline 74 340 4speed

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    • Posts: 481
    Re: 340 cam selection....
    « Reply #1 on: May 31, 2007 - 12:34:07 PM »
    How is your engine put together?  What heads, intake, carb, igintion, compression do you have?  What gear are you running and what type of trans is in the car?  From what I can tell about the specs on crane's website (listed below), this would be a good cam for an almost stock engine. 

    Valve Setting: Intake .000 Exhaust .000 HOT
     
    Lift: Intake @Cam 3027 @Valve 454 All Lifts are based
    on zero lash and theoretical rocker arm ratios.
      Exhaust @ Cam 3027 @Valve 454
    Rocker Arm Ratio 1.5     
     
    Cam Timing: TAPPET @.004
    Lift:   Opens Closes ADV Duration
      Intake 27 BTDC 65 ABDC 272 °
      Exhaust 67 BBDC 25 ATDC 272 °
     
    Spring Requirements:   Triple   Dual   Outer   Inner
    Part Number 99835
    Loads Closed 113 LBS @ 1.600 or 1 19/32
      Open 290 LBS @ 1.170     
     Recommended RPM range with matching components
    Minimum RPM 1800
    Maximum RPM 5200
    Valve Float 5800
     
    Cam Timing: TAPPET @.050
    Lift:   Opens Closes Max Lift Duration
    Intake 3 BTDC 33 ABDC 105 216 °
    Exhaust 43 BBDC (7) BTDC 115 216 °

    A side note, I found this on a cam chart on the internet.  It is the stock cam specs for a 68 340 equipped with a manual trans.

                                                                                 duration @.050          valve lift            lsa            valve lash
    A Eng.   P3412044     68 340 Man.-114      276/284      .444/.453"   112      Zero
     
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    Andy
    1967 Camaro SS: 406 sbc 505 hp/506 ft lbs|4 speed|Posi|3.73s
    1969 C/10  350|Turbo 350
    1969 Dodge D300 318|4 speed|Dana|4.88s
    1972Nova: 350|Turbo 350
    1974 'Cuda: 340|4 speed|Dana 60|4.10s|posi
    1999 Camaro SS: Auto|Longtube Headers|True Duals|TT2s
    2013 Challenger R/T: 6 speed|Hurst with pistol grip|mopar performance exhaust|super track pak

    Offline HemiOrange70

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    Re: 340 cam selection....
    « Reply #2 on: May 31, 2007 - 01:26:14 PM »
    stock ignition-points, stock compression, (9.5/10-1) 650 4 barrell, 904 trans with shift kit and stock convertor, 2.02 j heads stock bore.
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    Offline Chryco Psycho

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    • Posts: 36620
    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: 340 cam selection....
    « Reply #3 on: May 31, 2007 - 11:45:47 PM »
    Wouldn`t be my choice , I would use a more modern grind like a K54 Engle , it will idle like stock & work better
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    Challenger - You`ll wish You Hadn`t

    Offline Mopar God

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    • Posts: 50
    Re: 340 cam selection....
    « Reply #4 on: June 01, 2007 - 07:02:31 AM »
    True, the Engles are good pieces, but I am partial to custom designs. I haven't used an off-the-shelf camshaft gring since 1988.

    The camshaft you describe would be a good choice for a stock engine and perhaps, even a mildly modified one. To be sure you get the right profile, you would need to describe your entire combination to include how you will drive the car. For your compression, carburetion and street useage, I would probably use employ .450"/.450" lift and 215°/221° @ .050" on a 110.5° LSA.

    That's just a ballpark guesstimate, but I have used this camshaft in 273's with very good results...Robert
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