400 crank???383?

Discussion in 'High Performance Modifications' started by camaro19791000, Feb 18, 2010.

  1. camaro19791000

    camaro19791000 Veteran Member

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    ima keep it nice and simple ive got a 73' chevy p/u 350 4bbl qjet 72cc heads and is as stock as it can be, anyway
    would swapping the old cfrank for a 400 crank make my little smogger a 383???
    wat other mods would i need to do??
     
  2. David Hartley

    David Hartley Veteran Member

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    Yes but you cant just swap cranks. First to be a 383 you have to bore your block .030 then you will need new pistons , a new balancer and the flywheel from the 400. Then of coarse gaskets ect.
     
  3. camaro19791000

    camaro19791000 Veteran Member

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    oh ok i get you thanks
     
  4. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    .

    Back in the old days, it was extremely popular to get one of each, and build a 377" for your hot rod/racecar,
    and stick the 383" in your truck. It's not that difficult, and now a days everything is sitting on the shelf.
    As mentioned, you have to use the internal stuff with the internal crank & the ext stuff with an ext crank.
    Others like me, make all our cranks neutral, so that way you can just throw parts on there with no issues if you have a boo boo.
    I'm a huge fan of adding a 1/4 stroke whenever possible, SBC & BBC. If you pull the trigger, you will like the results.


    .
     
  5. NOBOTL

    NOBOTL Member

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    Doesnt the block have to be clearanced for the rods to clear?
     
  6. JasonZE

    JasonZE Veteran Member

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    yes the block needs to be clearanced.
    complete engine 383 kits are getting cheaper all the time with new crank rods and pistions etc for 600 bucks
     
  7. MyBoTy

    MyBoTy Veteran Member

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    If you have a decent crank grinder close, use a 400 crank. They're nodular iron and will take quite a beating. I'd chunk the 400 rods, they're the worst of Chevy's design. You can either run stock 5.7" rods or aftermarket of that length or 6.0". Pistons are plentiful, just make sure you mock everything up before final balance work or you might have to do it twice.
     

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