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That is weird! All I can think of is the piston rings on #3 and #4 some how got the gaps lined up so oil just went right to the head chamber. It's strange that it happened only on one side, and not the other side. They could have been damaged installing them also, or installed upside down.
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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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