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Thread: Is it a 454 or 427 BBC

  1. #1
    probablecause
    I have a bbc engine with a casting number of 399289 and was told that it was a 427. However, I have been to several engine sites that say that it can also be a 454.
    The pistons are TRW forged Part# "L2239NF .30" and the crank has a part # of "6223". Is there a way to tell which one it is?
    Paul
    Paul407@aol.com
    [ July 31, 2002, 07:09 AM: Message edited by: Paul407 ]

  2. #2
    Hotcrusader76
    Paul407:
    I have a bbc engine with a casting number of 399289 and was told that it was a 427. However, I have been to several engine sites that say that it can also be a 454. Is there a way to tell which one it is?
    Paul
    Paul407@aol.comIts definitely not a 454! I bounced the numbers with my sources. Its gotta be a 427

  3. #3
    Jordy
    All depends on the stroke. The bore is the same between the 454 and the 427. Accoring to Mortec.com it is a 454. But if the motor was ever apart, a 427 crank could have been put in to it with no major issues.
    427 = 4.250" x 3.76"
    454 = 4.250" x 4.00"
    Jordy

  4. #4
    Jordy
    Off mortec as well:
    399289.....454.......73-79
    Mortec
    Jordy

  5. #5
    Hotcrusader76
    jordanpaulk:
    Off mortec as well:
    399289.....454.......73-79
    Mortec
    Jordy I am going by the casting list index book for BB Chevys.
    Note- LOL...it does say that block casting numbers aren't 100% reliable..WTF! Right on the index of the book.....So why did I buy it then???? HHHmmmmm LOL...
    But yeah you are right, its the same block, different stroke....Thanks Jordy
    -Ty
    [ July 30, 2002, 09:29 PM: Message edited by: Hotcrusader76 ]

  6. #6
    Blown Cheyenne Hydro
    is it internally or externally balanced??
    internally....427
    externally....454

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