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[QUOTE="Ol'89r, post: 1377945, member: 17212"]
The piston is designed to work with the cylinder it is intended to be used with.  Taking one piston from one brand and installing it in another brand will usually not work, even though they are the same size in diameter.  Each manufacturer uses their own port design and placement.  The cut-a-way on the piston has to match the port size and placement in the cylinder.

The dome is also critical and has as much to do with squish pattern as it does compression.  The shape and angle of the dome has to fit the head and be the same angle as the squish pattern in the head.

The wrist pin on one engine may be the same diameter as the wrist pin in another brand but, the placement of the pin in relation to the deck heighth of the piston is usually not the same.

If you take a piston from one brand and match it up against another brand, you will see many differences between the two pistons.

You can modify your existing piston like Matt suggested by cutting new windows in the skirt or machining the existing transfers but, unless you really know what you are doing, you would be better off to let someone like Eric Gorr do the work for you.
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