390 displacement question
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390 displacement question
If my 390 has been bored .060 over, what is its displacement now? Does anyone know the formula for this? Also, if i am running about 130 lbs of compression on each cylinder is there a way to calculate the compression ratio?
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Joined: May 2003
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From: south louisiana
402 cubic inches. Bore radius squared, times Pi (3.1416) times the stroke, then multiply times the number of cylinders. If you want to convert to cc's to figure the comp ratio, multiply the cubic inches times 16.387. Example: 4.05/2 = 2.025, then 2.025 X 2.025 = 4.100625( X 3.1416) = 12.8825. 12.8825 X 3.78 = 48.6959. 48.6959 X 8 = 389.567.
Last edited by baddad457; Nov 3, 2006 at 08:48 PM.
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