How to tell the difference between a tall deck and a short deck 454? - Page 2
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How to tell the difference between a tall deck and a short deck 454?

  1. #15
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    Running on Empty, The actual measurement is from the flat of the deck to the center of the main bearing bore ( center of the crankshaft ). A standard (short deck) block measures 9.800 inches, (just a little over
    9 3/4 inches). A tall block measures 10.200 inches (just a little under
    10 1/4 inches).

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  3. #16
    River Rat sangervdrive's Avatar
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    Quote Originally Posted by prostock View Post
    Running on Empty, The actual measurement is from the flat of the deck to the center of the main bearing bore ( center of the crankshaft ). A standard (short deck) block measures 9.800 inches, (just a little over
    9 3/4 inches). A tall block measures 10.200 inches (just a little under
    10 1/4 inches).
    Thats what I was gonna say. Easiest and quickest way.
    K and D Racing

  4. #17
    Distinguished Member David 519's Avatar
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    Quote Originally Posted by ColeTR2 View Post
    I have never heard of a tall deck 454 only a 427 If you want to build a big cubic inch BBC I'd just go get a new after market block. Once you do all the machine work on a old tail deck block you will find out it's only a few hundred more for a new block that's way better. And you can make it even bigger.
    If you can swing the budget, a big +1 on an aftermarket block... I'll NEVER run an OEM block ever again. I just finished my first tall deck BBC, turned out pretty nice. I found a Bow Tie block used for a reasonable price, so they're around. With a tall deck aftermarket block, it's real easy to build a 632 with off the shelf parts.
    We used spacers on the intake so a standard deck intake works fine. IMHO they look a little jankey but I can live with it.

  5. #18
    1976 Sanger Flattie Running_on_Empty's Avatar
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    mortec.com only has 90-91 IV being of any deck difference and my bolck is a 76

  6. #19
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    Quote Originally Posted by Running_on_Empty View Post
    mortec.com only has 90-91 IV being of any deck difference and my bolck is a 76
    That's not correct, go back and look again, they show a bunch of different truck blocks. What is the casting number on yours?

    Any of the other measuring methods mentioned above will help you determine also.
    Last edited by obnoxious001; 03-28-2008 at 04:02 PM.

  7. #20
    Jackwagon Patrolman Rexone's Avatar
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    Damn talk about 25 ways to skin a carrot.

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