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Can anyone tell me what cubic inche this combo comes out to?

Discussion in 'The Garage' started by Emmettology 101, Aug 12, 2002.

  1. Emmettology 101

    Emmettology 101 3/4 ton status

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    Trying to figure out what cubes this combo would ocme out to:

    350 block bored 30 over
    400 crank for 350 block
    6" rods

    Need anything else for the equation?

    Thanks!
     
  2. HarryH3

    HarryH3 1 ton status Author

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    The bore would be 4.030 inches, and I think the 400 crank has a stroke of 3.75 inches. Rod length doesn't affect CID. So you'd have a 383. Well, it's really 382.67, but we'll round it up. /forums/images/icons/wink.gif
     
  3. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    That is the makings of a nice 383. The rod length doesn't effect the cubic inch displacement, but they make for a much better rod:stroke ratio lessening the side loads on the piston.

    Mike
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    Thats what I thought. That is the configuration on the engine in the truck I just bought. The guy I bought it off of said it was only a 362 or so since it wasn't bored 60 over, but hell the new GM 383 is a stock bore!

    Thanks Harry!

    Now I just have to get it back to FI.. IT is carbed now. It has good power but it seems to be asleep a little. When he first built it he had the stock TBI system on it and the truck and 38's.... The truck would llight up the 38's without a problem. Since it was swapped to a carb, it doesn't have that kind of power anymore... It wont do that with 35's now.
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Sounds like a sweet ride! But a 362? That would be true if it only has a 350 crank in it, instead of the 400 crank. If it's .060 over AND has the 400 crank, then it's a 388. /forums/images/icons/cool.gif
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    Nope, just .030 over... Thanks for getting me your figures. I was worried I was talkin up the truck with a 383 and there was a possibility it wasn't a 383.... Now I need to get to work on swapping on an LT1 injetcion system!
     

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