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4 Bolt Main 400 Chevy Engine

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by LA Bogger, Feb 24, 2002.

  1. LA Bogger

    LA Bogger 1/2 ton status

    Joined:
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    Location:
    Robins AFB, Georgia, USA
    Is there a strength difference between 400 small block 2 bolt main and 4 bolt main? I hear that the 2 bolt is actually stronger than the 4 bolt. Any information would be appreciated.

    Thanks

    Eat More Mud!!!
     
  2. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
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    Location:
    San Marcos, Ca USA
    If your looking to build your 400 for 0-5500 rpm then either one will work great. If your looking for something to run up in the 5500 to 7000 range (yikes) or a forged crank then it would be worth your while to get a 2 bolt main and adapt it to 4 bolt with a splayed 4 bolt kit. You can go with a stock 4 bolt block and probably never have any problem as well. The strength issue your refering to is where the 4 bolts crack between the bolts which is why many people prefer the splayed kit. Hope this helps.

    I started with nothing and I still have most of that left! - <a target="_blank" href=http://community.webshots.com/user/borregok5> Pictures</a>
     

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