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Its a 454!!! not 396

Discussion in 'The Garage' started by jimmy'sjimmy, Mar 29, 2005.

  1. jimmy'sjimmy

    jimmy'sjimmy 1/2 ton status

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    just looked up the block numbers for what was sold to me as a 396 but it turns out to be a 454!!! :cool1: anyone have info on blocks w/ #3999289? everywhere i looked on the net said it was a 454 any other way to make sure?
     
  2. k20

    k20 3/4 ton status

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    measure the bore lol, if its 4.25 its a 454, if its barely over 4(I dont remember the exact #), its a 396.
     
  3. sled_dog

    sled_dog 1 ton status

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    hes right, the casting number is 454 not 396.
     
  4. k20

    k20 3/4 ton status

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    yeh I got the same thing on a casting number search, but, if his casting #s are anything like mine, they are next to illegible. Also, says it is either a 2 or 4 bolt main, pull off the pan, see whatcha got man...
     
  5. jimmy'sjimmy

    jimmy'sjimmy 1/2 ton status

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    i'll pick it up in a week or two, its still at the guys house. hes our diesel mechanic, he said it has a steel crank and shorty headers. he was going to put it in his firebird but the firebird already had a beefy motor, so he wants to get it out of the way. when i pick it up ill leave it in the shop so we can go over the whole thing. i cant wait :D
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

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    extenally balanced...

    A 454 will have a "half moon" cutout on the harmonic balancer,and a weight on the flywheel(if you are getting it complete)--the other big blocks use a regular flywheel and non-counterweighted balancer..be sure you put the right one on if its a 454,or it will shake itself off the mounts...
    Good score if you got a 454 instad of a 396!! :grin: :waytogo:
     

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