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Old 02-26-2007, 08:46 AM   #1
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351 Bored .30 over

I'm a noob at figuring these things out what would be the new displacement of the engine if it was bored .30 over? Also what is the formula to figure this out?
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Old 02-26-2007, 11:07 AM   #2
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Re: 351 Bored .30 over

357ci

CID = NOC x 0.7854 x Bore x Bore x Stroke.

8 x .7854 x 4.03 x 4.03 x 3.5 = 357

CID : Cubic Inch Displacement
NOC : Number of Cylinders
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Old 02-26-2007, 06:24 PM   #3
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Re: 351 Bored .30 over

where does 0.7854 come from?
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Old 02-27-2007, 01:29 AM   #4
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Re: 351 Bored .30 over

I have no clue. I guess some mathematician made it up. I just know it works lol.
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Old 02-27-2007, 10:21 AM   #5
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Re: 351 Bored .30 over

The number 0.7854 is arrived at by dividing Pi by four (3.1416 Div. 4 = 0.7854)
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Old 02-27-2007, 10:22 AM   #6
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Re: 351 Bored .30 over

The number 0.7854 is arrived at by dividing Pi by four (3.1416 Div. 4 = 0.7854)

i found that on site for measuring the gauge of a wire. maybe part of the equation for calculating the volume of a cylinder?
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Old 02-27-2007, 11:18 AM   #7
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Re: 351 Bored .30 over

Yep! Now that you mention it I remember that from tech school years ago lol.
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