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Bore Question

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Old 03-19-2007, 09:48 PM
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Hey, i heard recently that 1mm of bore = 40 over

is this true or no?
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Old 03-19-2007, 09:59 PM
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That is true but its not exact.

.040 or "40 over" = 1.024mm

So the answer is yes.
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Old 03-19-2007, 10:00 PM
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ok thanks a lot
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Old 03-19-2007, 10:17 PM
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pardon my retardation (slowness). but what does 40 over mean?
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Old 03-19-2007, 11:15 PM
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its a measure of the size u increase ur piston and ur block to accomodate the bigger piston.
..from what i understand
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Old 03-20-2007, 07:09 AM
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"40 over" refers to boring out the cylinders in the engine block to 40 thousandths of an inch (0.040") over the stock bore.
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