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Thread: Combo Help
          
   
   

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  1. 08-11-2007 07:50 AM #1
    Geezer2's Avatar
    Geezer2
    Geezer2 is offline CHR Member
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    Join Date
    Aug 2007
    Location
    Dunedin
    Car Year, Make, Model: 1976 Cadillac Seville with 454 Chevy
    Posts
    421

    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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