80 inners campared to 40 inners

Aug 21, 2003
i got some wild ideas but i need to do a little research before i jump into it. beside the length what is the difference between 40 inners and 80 inners? i know that the inner splines are the same but will my 40 or mini birfs fit the outer splines? and also what is the difference in girth whaere the seal rides? thanks for any info.

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