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Author Topic: Bore size to cc  (Read 612 times)

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Re: Bore size to cc
« on: October 27, 2014, 04:03:04 am »
When people say 20 over, them mean the pistons is .020" bigger than stock. .508mm = .020 inch.

These are overbores.
.25mm = .010"
.50mm = .020"
.75mm = .030"
1mm = .040"
ect

If stock piston size is 64mm, and you have 64.5mm, you have a .020" overbore piston in there.
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