Is there an orifice tube on a 1977 Corvette A/C converted to R134?

JULIUS

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The car has an L-48 engine and the A/C has been converted to R134. I don't see where the Orifice Tube would be inserted on my system. It is my understanding that the Orifice Tube is only used on the L-82 engine A/C system; is that true?
 
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