Mine's 65mm, or about 2.5" from the opening in the case for the oil pump housing, to the no. 2 headpipe. That's with the S/S header, NOT the Kafer Cup system the used to have listed.
Hope this helps.
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Yetibone
'71 1302S 1.8
'73 1303S 2.3
'83 928S 4.7
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