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Thread: maximum cubes
          
   
   

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  1. #1
    vortec king is offline CHR Member Visit my Photo Gallery
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    maximum cubes

     



    whats the most cubic inches you can get out of a stock 400 small block? is it possible to stuff a 4.00 stroke crank into .060 bore 400 and get 434 cubes or how about 3.87 stroke crank in a .060 and make 422 cubes. whats require ? small base circle camshafts, rod grinding, block grinding?

  2. #2
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
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    Quote Originally Posted by vortec king
    whats the most cubic inches you can get out of a stock 400 small block? is it possible to stuff a 4.00 stroke crank into .060 bore 400 and get 434 cubes or how about 3.87 stroke crank in a .060 and make 422 cubes. whats require ? small base circle camshafts, rod grinding, block grinding?
    Yes, the 4.0 stroke will work.
    Get out your die-grinder and prepare yourself for a lot of work.
    Small base circle cam.
    .060 over bore and you are building a bomb.

  3. #3
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    Bolt a blower on a 350 and go faster than any 434, for a lot longer period of time.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  4. #4
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
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    Quote Originally Posted by techinspector1
    Bolt a blower on a 350 and go faster than any 434, for a lot longer period of time.
    Richard,Where have you been?
    My back has been sore for months.
    I can't do it all.L.O.L.
    Welcome back.

  5. #5
    gassersrule_196's Avatar
    gassersrule_196 is offline CHR Member Visit my Photo Gallery
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    why would .60 over be a bomb if thats the case im very suprise my hiroshima .125 over 283 is still alive :rolleye:

  6. #6
    techinspector1's Avatar
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    Quote Originally Posted by erik erikson
    Richard,Where have you been?
    My back has been sore for months.
    I can't do it all.L.O.L.
    Welcome back.
    Thanks a bunch Erik, I'll do what I can....
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  7. #7
    techinspector1's Avatar
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    Quote Originally Posted by gassersrule_196
    why would .60 over be a bomb if thats the case im very suprise my hiroshima .125 over 283 is still alive :rolleye:
    Scooter, you're beautiful man.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  8. #8
    erik erikson's Avatar
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    Quote Originally Posted by gassersrule_196
    why would .60 over be a bomb if thats the case im very suprise my hiroshima .125 over 283 is still alive :rolleye:
    Hi,Scooter.
    Let's put it this way.
    I would trust your .125 283 if it where done correctly before I would trust a .060 over 400 block.
    I have sonic tested a bunch of them over the years and all the ones I tested scared me.
    Plus the siamese cylinders are not the greatest with hot spots etc.
    This becomes worse at .060 over.

  9. #9
    camaro_fever68's Avatar
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    If it's a GM production block, you'll likely hit water before you get enough clearance for the 4in stroke. Try to keep the overbore to .030" also. Cylinders start getting really thin and close after that. My block sonic tested good enough for 4.170 overbore but I kept it at 4.155. I also had alot of clearancing to do to get the 3.875 stroke to clear. A small base circle is needed for sure and I still had minimum clearance on the cam.
    RAY

    '69 Chevelle--385
    '68 Camaro--Twin Turbo
    '78 Luv--383

  10. #10
    erik erikson's Avatar
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    Quote Originally Posted by camaro_fever68
    If it's a GM production block, you'll likely hit water before you get enough clearance for the 4in stroke. Try to keep the overbore to .030" also. Cylinders start getting really thin and close after that. My block sonic tested good enough for 4.170 overbore but I kept it at 4.155. I also had alot of clearancing to do to get the 3.875 stroke to clear. A small base circle is needed for sure and I still had minimum clearance on the cam.
    I have never hit water but yes it can happen.

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