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305 V8 .040 over makes it a 319?

Discussion in 'The Garage' started by kennyw, Feb 16, 2004.

  1. kennyw

    kennyw N9PHW Premium Member

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    If I did the math right a 305 V8 bored .040 over would be a 319 right? (Going into a Camaro)

    Bore Area x Stroke x 8 = CID

    [(3.807/2)sq x 3.1412] x 3.480 x 8 = 319
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    No, a 305 has a standard bore of 3.735" with a 3.48" stroke which would make a .040" oversize 305 a 311.59755 to be axact.

    The formula is (bore) x (bore) x (stroke) x (.7854) x (number of cylinders) = displacement
     
  3. kennyw

    kennyw N9PHW Premium Member

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    Ok, the website I found for the 305 specs listed a 3.767 bore as std... Ok, redid the #'s with the std bore I found and it came out to 310 /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/wink.gif

    Ok, looks like I have a 312 V8 now. /forums/images/graemlins/thumb.gif
     
  4. kennyw

    kennyw N9PHW Premium Member

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    [ QUOTE ]
    The formula is (bore) x (bore) x (stroke) x (.7854) x (number of cylinders) = displacement

    [/ QUOTE ]

    That formula looks weird to me though... Lets see does .7854 x bore x bore = π x r x r since bore/2 = r /forums/images/graemlins/smirk.gif Guess that works but not accurate enough for my tastes /forums/images/graemlins/thumb.gif
     
  5. kennyw

    kennyw N9PHW Premium Member

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    π x [(3.735 + .040)/2]sq x 3.480 x 8 = CID

    3.1412 x [3.775/2]sq x 3.480 x 8 = CID /forums/images/graemlins/yikes.gif

    311.55788 = CID
     
  6. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    Standard bore is 3.735 - 3.736.

    3.736+.040= 3.776

    ((3.776/2)^2)*Pi*3.48=38.97 in^3/cylinder

    38.97*8=311.76 inch^3 = 5.1L



    My 305 is .060"
    3.736+.060= 3.796

    ((3.796/2)^2)*Pi*3.48=39.38 in^3/cylinder

    39.38*8=315.07 inch^3 = 5.16L
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    305 .040" over makes a lighter weight boat anchor. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif
     

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