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Thread: identifying a bbc

  1. #1
    SANGER-RICH
    How do you identify a 454. I need to know what year and if it is a LS6

  2. #2
    Jordy
    A block casting number would be a good start.

  3. #3
    SANGER-RICH
    I got this number off the left rear of the block
    14015445

  4. #4
    daddy b
    I got this number off the left rear of the block
    14015445
    Mortec.com states 454 78-90, 2 or 4 bolt for this year,(you'll have to pull the pan)
    I have one, 2 bolt now a 439 bbc. Got mine out of a 81 pu
    Most likely NOT a ls6, look at the head numbers as well under valve cover, You can also look at end of head to identify rec. or oval port.
    daddy b

  5. #5
    SANGER-RICH
    Mortec.com states 454 78-90, 2 or 4 bolt for this year,(you'll have to pull the pan)
    I have one, 2 bolt now a 439 bbc. Got mine out of a 81 pu
    Most likely NOT a ls6, look at the head numbers as well under valve cover, You can also look at end of head to identify rec. or oval port.
    daddy b
    Its def. 4 bolt so what hp is it?? does that depend on the heads, the casting number on the heads are 6272990 the block and heads say hi perf.
    Ok after researching this I have a 454 truck engine with replacement heads
    does that sound about right

  6. #6
    smalls
    Its def. 4 bolt so what hp is it?? does that depend on the heads
    Heads, Pistons and Cam.....

  7. #7
    SANGER-RICH
    Heads, Pistons and Cam.....
    suppose it was completely stock what would the hp be?? with 4barrelll

  8. #8
    biesemeyer
    250hp

  9. #9
    connell50
    At the lake last weekend we talking about how you identify a factory two bolt and four main on a big block. If you look at the plug above the oil filter
    the 4 bolt will have 3/4 plug and two bolt will be smaller.

  10. #10
    Senior Member
    Join Date
    Feb 2009
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    L.B.
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    850
    At the lake last weekend we talking about how you identify a factory two bolt and four main on a big block. If you look at the plug above the oil filter
    the 4 bolt will have 3/4 plug and two bolt will be smaller.
    Like "biesemeyer" said---you have to take the pan off..mine has the small plug....Steve

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