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    sixfootman2005's Avatar
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    Which motor is this?

    my dad bought a 63 impala on Sunday......we were told it had a 403 big block.....then we realized there is no such thing.....so i'm thinking it could still be a 403(not original of course) the only numbers i can find are "411990" with "D6 CE" right under it....we should have it pulled out this week/weekend....anywhere else i should look for numbers? thanks

    i can get pics if you want....oh yea and the impala was in a demo derby so there's not much good left



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    Re: Which motor is this?

    pics...

    im thinking a 396 bored over..if its a rat motor.




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    Re: Which motor is this?

    Where is that number from??




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    Re: Which motor is this?

    409 not 403.....
    409 impalas were chevys first BB motor,powerful in its day,lame by todays standards


    Like the beachboys song,my lil 409 lalalalala




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    Re: Which motor is this?

    She's real fine, my 409.






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    Re: Which motor is this?

    that number was off the intake manifold



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    Re: Which motor is this?

    Quote Originally Posted by sixfootman2005
    that number was off the intake manifold
    Then that will be the casting numebr for the IM. Get the one off of the block




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    Re: Which motor is this?

    Prolly a 396 bored, or the 409, or maybe someone was retarded, and bored a 400 to a 403. Why they would do that, I dont know...

    You know, I still dont know what rat motor means exactly...I never quite got that.




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    Re: Which motor is this?

    Quote Originally Posted by marleyskater420
    Prolly a 396 bored, or the 409, or maybe someone was retarded, and bored a 400 to a 403. Why they would do that, I dont know...

    You know, I still dont know what rat motor means exactly...I never quite got that.
    small block = mouse
    big block = rat

    400 is a small block iirc..




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    Re: Which motor is this?

    im doubting its a 409 there kinda hard to find nowadays and if it was used in a derby i would say a 396



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    Re: Which motor is this?

    Quote Originally Posted by Matt281
    small block = mouse
    big block = rat

    400 is a small block iirc..
    ahh.

    400 is the small block that never could. Its not a BB,and its not a SB, its just there..

    Technically, I think you could call it a BB, because pontiac used it to make its BB 455's using the same block.




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    Re: Which motor is this?

    Quote Originally Posted by marleyskater420
    ahh.

    400 is the small block that never could. Its not a BB,and its not a SB, its just there..

    Technically, I think you could call it a BB, because pontiac used it to make its BB 455's using the same block.
    lol, well.... no


    quick way to tell if its a 409 is by the valve covers. if they look like an upside down "w", hence the term "w motor", then it is. but if they are rectangular then its definetly not. look behind the drivers side head on the mounting flange for the casting number and i can tell you more




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    Re: Which motor is this?

    if it has 6 valve cover bolts it's a big block. 4 = small block




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    Re: Which motor is this?

    Quote Originally Posted by Dpc69ss
    lol, well.... no


    quick way to tell if its a 409 is by the valve covers. if they look like an upside down "w", hence the term "w motor", then it is. but if they are rectangular then its definetly not. look behind the drivers side head on the mounting flange for the casting number and i can tell you more

    No to what?




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    Re: Which motor is this?

    no, its not considered a bb...




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