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Typically Porsche rods are avialable in a center to center lenght of 5.00 or 127mm if you like.
To figure this out you will need to measure from the center line of the case and add 1/2 the stroke and the rod center to center that will give you the reciprocating component to the center of the piston pin write it down. Measure the length of the barrel add it to the equation and subtract or first measurement from it that the difference minus your ascribed deck height will give you the Compression Height of the piston, figure what compression ratio you want (this is different than compression height) and call a good Piston manufacturer he will go over your figures with you and Wa La.
Basically that is how it is done.
regards
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