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Quick Ques. 305, 350, 400

Discussion in 'The Garage' started by BigBurban350, Jan 9, 2003.

  1. BigBurban350

    BigBurban350 1/2 ton status

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    Are the crank journals all the same size in 305, 350, and 400 small blocks? /forums/images/graemlins/usaflag.gif /forums/images/graemlins/burb.gif /forums/images/graemlins/usaflag.gif
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    305s and 350s have the same main journal diameter of 2.45". 400 cid engines have 2.65" dia. main journals. Most 327s and all older SBs had 2.3" dia. main journals.
     
  3. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    327's past 69?????I THINK /forums/images/graemlins/truck.gif had the same size mains as 350's and 305 's and 307's
     
  4. Sandman

    Sandman 3/4 ton status Author

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    The 327's went through a change sometime. the newer ones had the same size bearings. dont remember when they changed though.
     
  5. Mreetz

    Mreetz 1/2 ton status

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    Arnen't 400s externally balanced as well?
     
  6. BigBurban350

    BigBurban350 1/2 ton status

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    So do stroker kits (383/388) have a specially made crank with 350 journals, or do you got to bore the journals?
     
  7. Sandman

    Sandman 3/4 ton status Author

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    They most certainly are! /forums/images/graemlins/grin.gif As well as the 454. I ran a 400 for many years and then switched to a 454. I used the same flywheel. You cant use the same harmonic balancer though.
     
  8. bigmack

    bigmack 1/2 ton status

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    The stroker cranks will have the main journal size of the 350, but the stroke of a 400.
     
  9. Blazer1970

    Blazer1970 1/2 ton status

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    Or you can use a 400 crank, and have the main journals turned down to the smaller dimension. This is how the idea of the 383 originated.
     
  10. bigmack

    bigmack 1/2 ton status

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    Yep, you sure can. That is what alot people do. If you allready have a 400 crank, it would be cheaper to have the mains turned down than to buy a whole new crank.
     

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