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Thread: Advise, Is This Cam To Big?

  1. #1
    1BIGJIM
    Need advise. This is the Cam Comp Cams recommended. As you know, you can call twice and get two different choices. Seems to be a lot of overlap in the duration. IS THIS CAM TO BIG?
    Specs
    454 being stroked to 496
    9:1 Compression
    IMCO Power Flow Exahust
    781 Large Oval Ports nothing special
    5,300 RPM MAX (scared to turn it faster)
    Barry Grant 750 Sea Demon
    Cam Suggested
    Extreme Marine 11-240-4
    @.050 Intake 234 Exhaust 244
    Lift Intake 564 Exhaust 566
    112 center line
    RPM RANGE 2000-6200

  2. #2
    Senior Member
    Join Date
    Feb 2009
    Posts
    678
    Need advise. This is the Cam Comp Cams recommended. As you know, you can call twice and get two different choices. Seems to be a lot of overlap in the duration. IS THIS CAM TO BIG?
    Specs
    454 being stroked to 496
    9:1 Compression
    IMCO Power Flow Exahust
    781 Large Oval Ports nothing special
    5,300 RPM MAX (scared to turn it faster)
    Barry Grant 750 Sea Demon
    Cam Suggested
    Extreme Marine 11-240-4
    @.050 Intake 234 Exhaust 244
    Lift Intake 564 Exhaust 566
    112 center line
    RPM RANGE 2000-6200
    Hey BigJim...
    Comp Cams are very gd cams...i have run them for years in a # of different engs...usually they try to steer u rite on there recommendations...if u dont feel gd about there suggestions...try calling a few other cam manuf & see what they say before u make a decision...as far as ur mtr goes...everything sounds gd to me...i think u will find tho...that u will need a bigger carb...somewhere in the 850cfm to 900cfm range...u dont want to starve that mtr for gas!...also...maybe a little head work...match the ports (I&E) and clean up the pockets...otherwise...sounds great...just my .02 cents worth
    fastrat

  3. #3
    Foggerjet
    Bigjim, That cam is actually quite mild. Which is precisely what you need with your 9:1 CR. Should work good and pull hard down low and through the midrange. There are a bunch of factors that go into the "perfect" camshaft for an application, but that's about what I'd stab in a motor like yours.
    fog

  4. #4
    FlatRat
    Bigjim,
    I'm running a .030 over 454 two bolt,cast crank ,990 heads mild port job.Comp Cam 294 solid .595 lift 248 ,248 dur.110 CL 750 dp,have spun it up 6,800 rpm with no prob. :hammerhea

  5. #5
    SmokinLowriderSS
    I'm running a very similar Iskendarian setup in my 454.
    .565 lift, 280 deg duration, 110 deg lobe centers (running nitrous so stayed back from 112) 8.5:1 comp, large oval port irons, 2.02 intakes.
    Still breaking in but runs REALLY strong under the orriginal 700 holley 4150. Just haven't upgraded to a bigger carb yet. an 800 is somewhere in my future.

  6. #6
    TIMINATOR
    The cam size is fine,(about 230 or 235 at .050) it just needs to be a single pattern grind,the BBC heads use the same exhaust port for the peanut port,oval port, and the square port! We never use a dual pattern cam in a BBC oval port unless N2O or a blower is used. A single pattern cam makes more midrange torque, just what you need. Just my opinion, but this is what I do for a living...... Timinator

  7. #7
    BK
    The cam size is fine,(about 230 or 235 at .050) it just needs to be a single pattern grind,the BBC heads use the same exhaust port for the peanut port,oval port, and the square port! We never use a dual pattern cam in a BBC oval port unless N2O or a blower is used. A single pattern cam makes more midrange torque, just what you need. Just my opinion, but this is what I do for a living...... Timinator
    Thats exactly what I was told when I put my current motor togeather. Im running the same Isky cam as SL. My motors .60 over 10-1 comp and also has the 781 heads with alot of work done to them.

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