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Discussion Starter · #1 ·
I purchase a 66 SS that is a project. The engine was rebuilt, but not finished and some part are missing. The question I have is: next to where oil pressure switch (light) connects, there is a larger port for which I cannot find a purpose. It is plugged or am I missing something. I have searched the assembly manual and cannot find any reference to that port. I appears to be a little bigger than the oil pressure switch port. Any help will be appreciated.

Ron Bidwell
 

· In Memoriam
66 El Camino 57 Chevy pickup 2004 Tahoe
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25,548 Posts
big block or small?

up by the distributor or down by the oil filter?
 
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