Quote:
Originally Posted by ls1nova71
It's most likely there for assembly line purposes, one line coming off the engine and one line coming out of the cab, after the cab is put on, just connected the two.
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This guy has it right. GM could build the entire cab assembly by using that union. Then when it came time to assemble the engine compartment, that union was there to receive the oil line from whatever engine the truck was spec'd with. Small block, big block, or six cylinder.
Otherwise they'd have had to keep several different oil lines on hand depending on which engine the truck received and snake it in afterward.