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Thread: What generation is my 454
          
   
   

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  1. #1
    Chris UK is offline CHR Member Visit my Photo Gallery
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    Angry What generation is my 454

     



    Guys, im in the UK and finding it really hard to find help on how to identify what generatoin my 454 is? The only details i have is as follows

    Engine number
    14015445...

    Year built 78-90...

    And it s a 2 BOLT crank

    Can anyone help me please.

    Thanks

    CJT

  2. #2
    Geezer2's Avatar
    Geezer2 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1976 Cadillac Seville with 454 Chevy
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    It's a Mark IV
    Buying parts I don't need, with money I don't have, to impress people I don't like

  3. #3
    Chris UK is offline CHR Member Visit my Photo Gallery
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    Thanks Geezer 2, but how do you find that information out? i couldnt find anything on the net to help me!

  4. #4
    Geezer2's Avatar
    Geezer2 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1976 Cadillac Seville with 454 Chevy
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    Quick and dirty. if it has a two piece rear seal it's a Mark IV. If it has a one piece rear seal it's a Gen V-Gen IV.

    The Gen V's came on board in 1992 (there may be some late 1991 date codes).

    Happy hunting!
    Buying parts I don't need, with money I don't have, to impress people I don't like

  5. #5
    big wad is offline CHR Member Visit my Photo Gallery
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    a site called mortec has all the casting numbers. cheers darin

  6. #6
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
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    i can tell them apart by the timming cover the mark 6 has a cast cover the mark 5 has a tin cover like a mark 4 . some of the mark 6 do not have fuel pump boss the mark 5/6 blocks are more square .looking by the oil filter there is not a set in like older mark 4 so they have no iron lip around the fiter.the mark 5/6 have one pic seal cranks and pans the photo by my name is a mark 6 that i turned over to a take mark 4 tin oil pan and timing cover by drilling and tapping the added holes this was partly done for the use of mark 4 steel billet caps and using one upper seal adapter i machine to work on the block and going to a two pic seal 4.250 crank and the front timming cover was just a better way to go the older mark timming set inside the engine the mark 5 still used hyd flat lifters were mark 6 used roller lifters. there other things to them are the EZ ways to check with no numbers i work on alot of them so i can tell from about 10 feet away
    Last edited by pat mccarthy; 01-19-2009 at 06:51 PM.

  7. #7
    Gusaroo's Avatar
    Gusaroo is offline CHR Member Visit my Photo Gallery
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    I have that same block, I got mine from a 1984 C30 Wrecker.

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