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Thread: 406 engine

  1. #1
    Junior Member APPRENTICE
    Join Date
    Aug 2007
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    10

    406 engine

    Hi all

    I am new in 406 engine and recently I decide to order 406 rotating kit 3.75" crank shaft with 6"conecting rod H beam. Do I need to order low base circle camshaft to avoid hitting connecting rod with camshaft like 383 engine or normal base camshaft work fine.

  2. #2
    Senior Member DYNO TECH
    Join Date
    Feb 2004
    Location
    Leonard, Texas
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    414
    I would order the small base circle cam.
    'A government big enough to give you everything you want, is big enough to take away everything you have.'

    Thomas Jefferson


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  3. #3
    Senior Member DYNO OPERATOR
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    Aug 2005
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    Rifle Colorado
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    585
    I've built a number of 406's and 383's with h-beam 6" rods and roller cams and have always used standard base circle. The only problem I've experienced was the first 406 I built. It had stock 5.7 rods and a small solid cam. I had to grind the cam side rod bolt heads to gain the necessary clearance. I'm pretty sure that most h-beam rods are profiled to gain the necessary clearance. You'll need to check it just in case.....

  4. #4
    Senior Member DYNO TECH
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    Feb 2004
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    Leonard, Texas
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    Quote Originally Posted by johnracer
    I've built a number of 406's and 383's with h-beam 6" rods and roller cams and have always used standard base circle. The only problem I've experienced was the first 406 I built. It had stock 5.7 rods and a small solid cam. I had to grind the cam side rod bolt heads to gain the necessary clearance. I'm pretty sure that most h-beam rods are profiled to gain the necessary clearance. You'll need to check it just in case.....
    I had the same problem with my first one back in 84. Now I just get the smaller base circle as a precaution. A little more clearance in this area can't hurt!
    'A government big enough to give you everything you want, is big enough to take away everything you have.'

    Thomas Jefferson


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  5. #5
    Senior Member DYNO OPERATOR
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    VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
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    I had the same problem with my first one back in 84. Now I just get the smaller base circle as a precaution. I little more clearance in this area can't hurt!
    Me too.

    Ed
    " Let all things that hath breath, praise the Lord. Praise Ye the Lord" Psalms 150 vs 6.

  6. #6
    Senior Member MASTER BUILDER
    Join Date
    Apr 2003
    Location
    Brookings South Dakota
    Posts
    244

    Re: 406 engine

    Quote Originally Posted by amal
    Hi all

    I am new in 406 engine and recently I decide to order 406 rotating kit 3.75" crank shaft with 6"conecting rod H beam. Do I need to order low base circle camshaft to avoid hitting connecting rod with camshaft like 383 engine or normal base camshaft work fine.
    You will not need a small base circle camshaft

  7. Racing Junk


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