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Wow! That "B" head has tiny chambers! Have you called CB and asked them? The 90.5 and 92 should be the same O.D.?
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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