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I see no real advantage to doing this. The hole is there for the cam gears to get oil from volume in bottom of case. If you open the hole up, you would have too much oil on the gears, more drag= less HP...
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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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