400 Block Up For Sale Locally

Discussion in 'Engine Topic' started by Bandit723, Oct 12, 2017.

  1. 74BIBELOT

    74BIBELOT Veteran Member

    Not remember well, but I think 4 bolt (400) has 3 freeze plugs each side and casting # 511
    2 bolts /2 freeze plugs.
    Casting # 509
    Not sure if correct!
     
  2. Bandit723

    Bandit723 Veteran Member

    2,251
    262
    Oct 1, 2016
    Waupaca WI
    I will definitely scrutinize this thing. If it does turn out to be a 4 bolt main i am out unless urged otherwise. From what i have read the 400 4 bolt mains are weaker than the 2 bolt ones whereas the 350 block is just the opposite.
     
  3. 79RedZ

    79RedZ Veteran Member

    582
    15
    Mar 24, 2009
    Hamilton,MI
    Get the suffix code and the casting date if you can.
     
  4. cadillac_al

    cadillac_al Veteran Member

    512
    33
    Apr 22, 2015
    Maine
    Since there was never a high performance 400 I don't know if it matters what year it is. You're just buying a block to build your own dream engine. The 4 bolt 400's weren't prized that much either. All you can hope for is a crack free core to build.
     
  5. Bandit723

    Bandit723 Veteran Member

    2,251
    262
    Oct 1, 2016
    Waupaca WI
    I am just looking for a good virgin spare block to have on hand. The one i have has been rebuilt a few times for various reasons so is close to being more than a better seasoned block.
     
  6. muscl car

    muscl car Veteran Member Lifetime Gold Member

    Just save some $$$$$ and get a Dart little M block !!
     
    77 cruiser likes this.
  7. 77 cruiser

    77 cruiser Veteran Member

    423
    10
    Nov 17, 2006
    Frostbite Falls MN
  8. muscl car

    muscl car Veteran Member Lifetime Gold Member

    Little M block is a better quality and able to take more abuse than a SHP
     
  9. Bandit723

    Bandit723 Veteran Member

    2,251
    262
    Oct 1, 2016
    Waupaca WI
    Not doing a new build here just stocking what i need to maintain what i have. Dart block or an SHP one would be nice to have but would cost me a few upgrades to get it done. The machinist i use is pretty reasonable. to cleanup a used 400 block would be half the cost of a new bare one.
     
  10. Rich Schmidt

    Rich Schmidt Veteran Member

    4,097
    13
    Mar 27, 2010
    Denville NJ
    No,the 4 bolt 400's are fine. I have built and blown up many 400's over the years. Aside from the late 70's blocks being weaker there is no difference in the strength of 400 blocks. The limiting factor for all of them is that eventually you won't be able to keep head gaskets in them if you get into real high power levels such as over 900 hp on boost or nitrous. The 4 bolts were made from 70-72 and were the best castings out there. The 2 bolts from 73-76 used the same casting only the hole for the 3rd freeze plug was not machined out. Like I said the real problem are the 76 and later 400's because the decks crack simply by tightening the head bolts down even in a stock rebuild. Total garbage.
     

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