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Generation III Internal Engine
408cid - 409cid

Generation III Internal Engine 1997-2006 LS1 | LS6

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408cid - 409cid

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Jan 15, 2004 | 11:46 PM

#1

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408cid - 409cid

for the 409CI from the iron block, are they just .040 over instead of .030?

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Jan 16, 2004 | 12:49 AM

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If I have this equation right then a 409 would be a 4.035 bore,

(Bore/2) squared, times Stroke, times # of Cylinders, times Pi

So a 4.0 crank would get these numbers,
Bore
4.000**** 402.12CID
4.030**** 408.18CID
4.035**** 409.19CID
4.040**** 410.21CID
4.060**** 414.28CID
Which looks about right to me.

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Jan 16, 2004 | 01:59 AM

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http://www.aera.org/tech/cube_calc.html

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Jan 16, 2004 | 08:30 AM

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thank yuou

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Jan 16, 2004 | 10:56 AM

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ALSO:

(BORE x 3.14) x STROKE x 8 cylinders = Cubic Inches

This will be a LITTLE low because you rounded PI off

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