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402 BBC really is a 454!

Discussion in 'The Garage' started by madmike, Mar 18, 2003.

  1. madmike

    madmike 1/2 ton status

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    OK, turns out what I thought was a 402 engine, really is a 454 block (casting no 3999289). Evidently maybe the factory ran out of 396 or 402 blocks, grabbed this 454 block, and only machined it for 402 use. I had the cylinder wall thickness sonic tested, and there is plenty of meat there to support a 454's 4.25" bore. Since it really is a 454 block, there is also enough to support a 0.030 and 0.060 overbore later if needed.

    If I can find a reasonably priced 4.00" stroke crank, I think I'll go ahead and reassemble it as a genuine 454! /forums/images/graemlins/cool.gif

    Who out there has a 454 crank (cast or forged) in good shape cheap?
     
  2. Z3PR

    Z3PR Banned

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    If you use your 396/402 crank shaft and bore it for the 454 pistons, you'll have a 427 if memmory serves me correct. Now being able to say it's a 427 would be very kewl in my honest opinion. /forums/images/graemlins/thumb.gif
     
  3. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    [ QUOTE ]
    OK, turns out what I thought was a 402 engine, really is a 454 block (casting no 3999289). Evidently maybe the factory ran out of 396 or 402 blocks, grabbed this 454 block, and only machined it for 402 use. I had the cylinder wall thickness sonic tested, and there is plenty of meat there to support a 454's 4.25" bore. Since it really is a 454 block, there is also enough to support a 0.030 and 0.060 overbore later if needed.

    If I can find a reasonably priced 4.00" stroke crank, I think I'll go ahead and reassemble it as a genuine 454! /forums/images/graemlins/cool.gif

    Who out there has a 454 crank (cast or forged) in good shape cheap?

    [/ QUOTE ]


    Well good for you! /forums/images/graemlins/thumb.gif That's the better kind of surprise....my engine was supposed to be a 427, and ended up only being a 396 when I tore it down! /forums/images/graemlins/mad.gif

    Oh well, at least NOW I know it's built right and that it will last.....the P.O. of my truck was kind of a knucklehead, and probably got tricked by the engine shop that built the motor for him.

    ......of course I got tricked too, so I guess there's TWO knuckleheads in my story!..... /forums/images/graemlins/rotfl.gif
     
  4. madmike

    madmike 1/2 ton status

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    Z3PR-Your memory is correct, and its possible I'll go the 427 route, but I'm down this far, so I'm gonna go big as I can at this point!

    Greg72-That's a bummer /forums/images/graemlins/tongue.gif, sucks to downsize when ya think you're going big. Glad ya got it built right, that's what I'm shooting for too! /forums/images/graemlins/grin.gif
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    Note that if you go to a 454 crank, you go from internal to external balance, so you have to swap the flywheel/flexplate and the damper also.
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    If you use your 396/402 crank shaft and bore it for the 454 pistons, you'll have a 427 if memmory serves me correct. Now being able to say it's a 427 would be very kewl in my honest opinion. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]

    Yep, thats right...that will make it a 427. /forums/images/graemlins/thumb.gif

    Now if he had a 402 block and used a 454 crank, that would make the motor a 435 cubic inch. /forums/images/graemlins/thumb.gif
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    [ QUOTE ]

    Now if he had a 402 block and used a 454 crank, that would make the motor a 435 cubic inch. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]A 402 block with a 454 crank would make a 427 not a 435.
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    [ QUOTE ]

    Now if he had a 402 block and used a 454 crank, that would make the motor a 435 cubic inch. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]A 402 block with a 454 crank would make a 427 not a 435.


    [/ QUOTE ]
    I checked my references and what I quoted was for a 402 block with a .030 overbore, or rather a 396 block bored .060 over, to get the 435 cubic inch.

    The references did list a standard 402 block, or a .030 overbore 396 block, and a 454 crank to be a 428 cubic inch rather than a 427. /forums/images/graemlins/thumb.gif
     
  9. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    [ QUOTE ]
    [ QUOTE ]
    [ QUOTE ]

    Now if he had a 402 block and used a 454 crank, that would make the motor a 435 cubic inch. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]A 402 block with a 454 crank would make a 427 not a 435.


    [/ QUOTE ]
    I checked my references and what I quoted was for a 402 block with a .030 overbore, or rather a 396 block bored .060 over, to get the 435 cubic inch.

    The references did list a standard 402 block, or a .030 overbore 396 block, and a 454 crank to be a 428 cubic inch rather than a 427. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]OK Wes, if we are going to argue size to the exact then lets BE EXACT. A STD. bore 402 block with a 454 crank is 427.44297 CI. A 402 block .030" over with a 454 crank is 433.68445 CI. /forums/images/graemlins/rolleyes.gif /forums/images/graemlins/thumb.gif
     
  10. madmike

    madmike 1/2 ton status

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    Blazer1970-you are correct, going from internal to external balance, I'm already taking that into account parts-wise.

    thatK30guy & 4X4High-I'm interested in building a stroker motor and maintaining a stock 4.25" bore (to save the block for future use). Flatlander racing and speed-o-motive have kits I'm gonna research a little today.

    4.25x4.25x4.25x0.7854x8=482ci! /forums/images/graemlins/cool.gif
     
  11. ben427

    ben427 1/2 ton status

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    If your gonna lok for a crank, id look for a 4.25" stroke crank to bump the displacement up a bit more, like about 483 cubes/forums/images/graemlins/thumb.gif
     
  12. b454rat

    b454rat 1/2 ton status Premium Member

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    Check this site out. wish I has some money.....
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    [ QUOTE ]
    [ QUOTE ]
    [ QUOTE ]

    Now if he had a 402 block and used a 454 crank, that would make the motor a 435 cubic inch. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]A 402 block with a 454 crank would make a 427 not a 435.


    [/ QUOTE ]

    I checked my references and what I quoted was for a 402 block with a .030 overbore, or rather a 396 block bored .060 over, to get the 435 cubic inch.

    The references did list a standard 402 block, or a .030 overbore 396 block, and a 454 crank to be a 428 cubic inch rather than a 427. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]OK Wes, if we are going to argue size to the exact then lets BE EXACT. A STD. bore 402 block with a 454 crank is 427.44297 CI. A 402 block .030" over with a 454 crank is 433.68445 CI. /forums/images/graemlins/rolleyes.gif /forums/images/graemlins/thumb.gif


    [/ QUOTE ]
    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif @ "if we are going to argue to the exact....." /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif
     
  14. Don

    Don 1/2 ton status

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    That's Close enough is'nt it? Nitpick, Nitpick, Nitpick!

    J/K /forums/images/graemlins/blush.gif
     
  15. Emmettology 101

    Emmettology 101 3/4 ton status

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    *using the Jedi mind trick*
    I think you would rather have a efi LT1!! I'll trade ya! /forums/images/graemlins/wink.gif

    I am going to have to start hangin aroudn you and Jerry, you guys are finding some sweet-a$$ deals!
     
  16. madmike

    madmike 1/2 ton status

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    Jerry is the real deal finder! I haven't come across any myself lately, cuz I'm broke and so absorbed in what I already have! /forums/images/graemlins/laugh.gif Got a ton of stuff, just need the funds to start putting it together.

    I did place an order on the parts for my 489 bbc the other day, I can't wait for the boxes to start showing up! /forums/images/graemlins/grin.gif
     
  17. bablazer73

    bablazer73 1/2 ton status

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    If you are gonna go big, since you already have to replce crank, I would go the 4.25 stroker. They have come way down in prices and can build an awesome motor. They can weld and remachine a stock crank to get just about any stroke you want!!
     
  18. madmike

    madmike 1/2 ton status

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    Dude- I did! /forums/images/graemlins/cool.gif I ordered 4.25" stroker crank kit from speed-o-motive. With a 0.030" overbore, its gonna be a 489ci! /forums/images/graemlins/grin.gif
     
  19. OrangeCrushK10

    OrangeCrushK10 1/2 ton status

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    [ QUOTE ]
    Check this site out. wish I has some money.....

    [/ QUOTE ]

    /forums/images/graemlins/eek.gif 602ci?! omg...I need it....If only I had the money...

    hmmm...

    Anyone need a kidney? Mine just went up for sale! /forums/images/graemlins/rotfl.gif
     
  20. Ddragggon

    Ddragggon 1/2 ton status

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    [ QUOTE ]
    Dude- I did! /forums/images/graemlins/cool.gif I ordered 4.25" stroker crank kit from speed-o-motive. With a 0.030" overbore, its gonna be a 489ci! /forums/images/graemlins/grin.gif

    [/ QUOTE ]I hope you're taking into account the nessecity to rebuild your transmission to withstand the now mad torque this thing is going to have now.... /forums/images/graemlins/grin.gif

    I'da gone 427: the shorter stroke allows you to rev the higher, granted this isn't going to be much a problem on a truck, unless you throw a tripplestacked doubler at the project...

    -Rich

    PS, Big Blocks rule, and make me happy.
     

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