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Thread: 434 Camshaft clearance

  1. #1
    Junior Member JOURNEYMAN
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    434 Camshaft clearance

    I thought I had read somewhere that in a stock block you are limited to how much camshaft you can throw at it without hitting the rods even on a small base circle, does anyone know if this is true? What is the limit? Thanks, any info greatly appreciated!

  2. #2
    Senior Member RACING JUNKIE
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    It kinda depends on the rods you use and what some cam manufacturers call a small base circle. Some cam grinders call a .930 a small base circle and some call a .900 a small base circle. In most cases you're safe with a .630 to .640 lift. I had bullit grind my cam and it's a .870 base circle, i'm running a .689 lift with a set of Lunati Promod rods, but it's also in a Dart lil "M" block, a stock block has the came cam height.

    Zip.

  3. #3
    Junior Member JOURNEYMAN
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    I have the eagle h-beam 3D stroker rod with L19 bolts, didnt know of the .870 base circle, thanks for the info!

  4. #4
    Senior Member SENIOR BUILDER
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    Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.

    Mock it up before the balance work..

  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by ccperf721p
    Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.

    Mock it up before the balance work..
    Yep!
    Mine is right in the danger zone, that why i ask them to grind it too an .880 BC which is not standard, but i'd seen the problem before.

    Zip.


  6. #6
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    .850 base circle, and ground a little off the Lunati Pro Mod rods on mine. The wider the LSA, the more issues you will have with clearance.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  7. #7
    Senior Member RACING JUNKIE
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    The number 2 rod is the clearance problem. Just pull it and run a 7 cylinder!
    Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke


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