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Thread: Picking the right lobe center

  1. #1
    Junior Member APPRENTICE
    Join Date
    May 2003
    Posts
    20

    Picking the right lobe center

    Am looking into a cam change from hyd roller to solid roller. engine is a 8.5 compression 489 bbc. Heads are 781 casting iron heads. Stone stock except larger valves. Intake is a dart with a pro systems dominator carb. Am switching to a weiand intake to try it. Current cam is a Lunati hyd roller with 242/252@.050 and 595.612 lift. 110 lobe sep. Glide with 4200 converter/brake. Best time is a 10.86 at 120. 60 ft at 1.42. Am looking at a cam with 262/270 and 636 lift but with a 114 lobe sep. Would this be a good choice or would the wide lobe sep bleed off to much cyl pressure and hurt the low end enough to change the 60ft times. Am happy with the current times but am always looking for ways to go faster

  2. #2
    Member JUNIOR BUILDER
    Join Date
    Feb 2008
    Location
    Childers Australia
    Posts
    99
    I realise that this is not what you asked but I feel that an increase in static CR would give you the greatest gain.I don't think that the bigger cam would be better unless there is a traction issue.IMO

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842

    Re: Picking the right lobe center

    Quote Originally Posted by 348409
    Am looking into a cam change from hyd roller to solid roller. engine is a 8.5 compression 489 bbc. Heads are 781 casting iron heads. Stone stock except larger valves. Intake is a dart with a pro systems dominator carb. Am switching to a weiand intake to try it. Current cam is a Lunati hyd roller with 242/252@.050 and 595.612 lift. 110 lobe sep. Glide with 4200 converter/brake. Best time is a 10.86 at 120. 60 ft at 1.42. Am looking at a cam with 262/270 and 636 lift but with a 114 lobe sep. Would this be a good choice or would the wide lobe sep bleed off to much cyl pressure and hurt the low end enough to change the 60ft times. Am happy with the current times but am always looking for ways to go faster
    No more compression than you have and with the torke converter your running, I would go with a 108 or 110 center line cam. If you get a 110 I would advance it 2 degress to a 108. It will help you off the starting line. I think the 114 will kill your 60ft.

  4. Racing Junk


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