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400 Crank into 350 Block

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mreetz, Feb 28, 2002.

  1. Mreetz

    Mreetz 1/2 ton status

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    Does this create a 383? Any suggestions for building a new engine for my '84 is greatly appreciated. I have a 400 block that I've started buying parts for, slowly........



    1984 K-5
    4" lift
    35x12.5 MTs
    buildin a 400 for it, any info greatly appreciated
     
  2. Triaged

    Triaged 1/2 ton status

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    Yes a 400 crank in a 350 block makes a 383. But if you have the 400 block build it! If you have the crank out of that 400 you would have to turn down the mains to get it to fit in the 350. Your other option is to buy a new crank that is made to fit the 350.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  3. Mreetz

    Mreetz 1/2 ton status

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    Thanks, I think I will stay with the 400 block then.

    1984 K-5
    4" lift
    35x12.5 MTs
    buildin a 400 for it, any info greatly appreciated
     
  4. bigmack

    bigmack 1/2 ton status

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    I agree, stay with the 400. I have one in my 2wd truck and it makes an a$$ load of torque and horsepower. Allways remember the old saying "There is no replacement for displacement".

    '80 K10 350/350/NP205/14B/10B/4.10/4"Lift/Q78-Buckshots
     
  5. hammer

    hammer 1/2 ton status

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    ref. 400 crank in a 350 is 377 ci standard 4.000" bore
    400 crank in a 350 with a 4.030" bore 383

    <font color=red>Let me at it I can break it</font color=red>
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I'd build the 400 too.

    Keep in mind to put a 400 crank in a 350 block, the main journals must be machined. You either use the 400 connecting rods (5.565", not recommended) or buy custom stroker pistons too.

    The 400 will make more power...I'd keep it. That's my dream motor.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Another vote for the 400. Biggest problem is finding a good set of heads.

    Also, putting a 400 crank in a 350 requires turning down the mains AND clearancing the block for the longer throw.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked, 4" lift, 42" tires
    Some day: massive cutting, shorter wb and rear overhang.
     

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