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Big block tranny/ small block tranny?

Discussion in 'The Garage' started by Thumper, Apr 27, 2004.

  1. Thumper

    Thumper 1/2 ton status

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    Im pretty sure I know the answer, but want to be sure.
    I have a smallblock in front of my 465... I may have a line on a 454... it will bolt in right? Do I need motor mounts? Any differences in clutch flywheel etc?
    Thanks.
    Mike
     
  2. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    no need. Bolt it in and go.
     
  3. big pappa b

    big pappa b 3/4 ton status

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    tranny will work fine. Pretty sure you can use the same motor mounts too but they do make some just for a BB. I believe the difference in in the height the motor sits..not sure. I have small black mounts on my 454 and it sits a little high. I need a little body lift for my valve cover to clear the brake booster
     
  4. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the fly wheel is different. you will need one for an externally balanced 454 /forums/images/graemlins/waytogo.gif
     
  5. big pappa b

    big pappa b 3/4 ton status

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    Yeah..that too /forums/images/graemlins/tongue.gif
     
  6. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    i think the difference in motor mounts is the bolt pattern where it bolts to the crossmember.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    The only difference might be in the diameter of the clutch that was used from the factory. Some were smaller than others. With a big block twisting on it, I would swap the clutch and pressure plate to the largest size that will fit in the bell housing. /forums/images/graemlins/eek.gif Unless you find that you already have the big 'un. /forums/images/graemlins/cool.gif Either one will fit, but the larger diameter clutch has more holding power...
     

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