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Thread: Combo Help
          
   
   

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  1. 08-11-2007 08:50 AM #1
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    Geezer2
    Geezer2 is offline CHR Member
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    Combo Help

     



    Building a 489" BB Chevy and need to have good vacuum. My combo is 4.280 Bore with a 4.250 stroke. I'm planning on using Edelbrock RPM heads, a Performer RPM dual plane with an 850 Double Pumper. My cam choice is either a Comp Cams Hydraukic Roller with 230/236 @ .050 with.547 lift on int/exh. or a Comp Cams Hydraulic Roller with 244/244 @ .050 and .612/.612 lift.

    I need first hand knowledge from anyone who has used either of these cams as to vacuum at idle.

    Woukd like to have 14-15 inches at idle. Hell, I'd like to have 14-15 inches period!!
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  3. 08-11-2007 08:57 AM #2
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    Quote Originally Posted by Geezer2
    Hell, I'd like to have 14-15 inches period!!
    Oh no, not another John Holmes!!!!!!!
    Duane S
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    On a quiet night you can hear a Chevy rust
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  4. 08-14-2007 03:33 PM #3
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    Antbody have experience with a hydraulic roller with this kind of duration???
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  5. 08-14-2007 03:44 PM #4
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    Stick with the first cam. You'll like it for all around reasons. The second will suffer vacuum losses and you'll find yourself winding it up a bit tighter than you feel comfortable with. Don't forget to run a loose converter and spend time degreeing the cam, allowing for chain stretch.
    What if the "Hokey Pokey" is what it's really all about?
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