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Thread: chevy 400
          
   
   

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  1. #1
    demetrice askew's Avatar
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    chevy 400

     



    why do they say u cant use 5.565 rods on a crank that is for 5.7 rods or 6.0 rods
    meat1037

  2. #2
    demetrice askew's Avatar
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    can someone help
    meat1037

  3. #3
    robot's Avatar
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    You need to explain your question better....like who says this?

    For a small block Chevy, the deck height is 10.400 inches; that is, the distance from the crank centerline to the top of the block surface where the heads bolt. This distance is equal to the sum of 1/2 of the stroke plus the rod length plus the piston height (from the piston pin to the top of the piston) plus how far the piston top is below the deck surface (a minor amount). A piston therefore is designed to fit the above equation. Also, on a piston, there is the skirt that is below the piston pin. The skirt is designed to clear the crankshaft counterweights....if a piston designed for a long rod is put on a short rod, the skirt would probably hit the crankshaft and the piston height would be so short that the piston would not go to the top of the bore..... and have low compression. Therefore, the pistons must match the rod length that the piston was designed for. Is this what you are asking about?

  4. #4
    demetrice askew's Avatar
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    chevy 400

     



    i got a 400 small block and i want to use my crank that i bought for my 383 i got the spacer for the mains so the crank will work in the 400. the thing is that i wanted to know will the 400 rods work with this crank. my friend said that i have to have 5.7 rods or 6.0 rod. i bought piston for the 400 rods will the crank work with this. the 383 stroke is a 3.75 and so is the 400 right.he said something about the counterweights. but it should work right
    Last edited by demetrice askew; 09-20-2007 at 12:20 PM.
    meat1037

  5. #5
    nitrowarrior's Avatar
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    Pistons dictate whether or not you use the original 400 rods. If your rods out of the 383 are 5.7, buy the pistons accordingly. Same with 6.0 rods. The difference is in the pin height built into the piston to accomodate the length of the rods you hsve.
    Last edited by nitrowarrior; 09-20-2007 at 02:40 PM.
    What if the "Hokey Pokey" is what it's really all about?

  6. #6
    demetrice askew's Avatar
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    so i can use the 383 crank with the 400 rods and piston
    meat1037

  7. #7
    robot's Avatar
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    It sounds as if you already have the block, bearing spacers, crank, rods, and pistons. If the pistons are for the 400 rod length, the block is a 400, then the only unknown is if the piston skirts will interfere with the crank counterweights. This should be easy enough to assemble one piston/rod and install it on the crank and rotate it to check (don't even need the rings to check).

  8. #8
    demetrice askew's Avatar
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    i took it all to the machined shop and bought everything new.new piston,spacers rod bolts and even had work done to the block
    meat1037

  9. #9
    500caddy is offline CHR Member Visit my Photo Gallery
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    first the deck hight is only 9" on avg.. i would run a 5.7 rod if your going to run a power adder later.. the 6" rod is pushing the top ring to close to the top. the crank will work and the 5.7 rods will work just buy the pistons for a 400 with 5.7 rods like nitro said.. ROBOT were did you get the info for deck hight.small blocks 9" a big block is 9.8..

  10. #10
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    Caddy, you are right, a small block is 9.025 deck

  11. #11
    demetrice askew's Avatar
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    so the 5.565 rods going to work fine the piston are speed-pro h400cp for the 5.565 rods.
    Last edited by demetrice askew; 09-21-2007 at 09:45 AM.
    meat1037

  12. #12
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    so the 5.565 rods and the seed-pro piston h400cp is going to work fine. thats what u all are saying. thanks
    meat1037

  13. #13
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    Dont know about the other guys, but I wouldnt say that it is OK....I say that it is super easy to check...why not be sure by checking it before you do the final assembly of the engine? A little work on the front end would potentially save a headache later.....I personally dont like to pull the pan after the engine is installed in the car!!

  14. #14
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    Speed Pro designed that piston for your set up. 1970-1980 400 engine with 5.565 rod. Will leave you at .025 in the hole and skirts should not be an interference problem.
    What if the "Hokey Pokey" is what it's really all about?

  15. #15
    demetrice askew's Avatar
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    thanks alot
    meat1037

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