How to distinguish big block from small?

Discussion in 'The Garage' started by dremu, Jul 23, 2004.

  1. dremu

    dremu Officious Thread Derailer Premium Member GMOTM Winner

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    Gonna go look at a truck which is alleged to have a 454 in it, but wanna make sure it's not had a 350 or something swapped in. Until now I've only dealt with SBC's ... is there some easy way to tell a BBC from a small, besides "it's bigger"? /forums/images/graemlins/laugh.gif

    Seeing as I've managed to confused an NP203 for a '205 (twice!) I am less trusting in my sight than I used to be /forums/images/graemlins/laugh.gif I have the tranny patterns down so I can tell a TH400 from a 350, but I donno anything about engines.

    -- A
     
  2. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    Valve covers, BB's have 7 bolts holding them on. Also the exhaust, the exhaust ports coming out of the heads are pretty evenly spaced, unlike a SB which the middle two are right next to each other.
     
  3. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Exactly , totally right /forums/images/graemlins/waytogo.gif. This was in a supersize post and shows the valvecover bolts on the bottom and even exhaust spacing .

    [​IMG]
     
  4. k5freak44

    k5freak44 1/2 ton status

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    yea sb= o oo o
    bb= o o o o
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    one of my friends stopped by when i had just the block, heads, intake on my truck, everything else was out. he said, "wow that is a small block" /forums/images/graemlins/crazy.gif

    what they said, and its bigger. /forums/images/graemlins/whistling.gif
     
  6. dremu

    dremu Officious Thread Derailer Premium Member GMOTM Winner

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    woohoo! Thanks all!

    -- A
     

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