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Drilling a ported vacuum source

From 1982 Chrysler New Yorker “Pappy's Chrysler”, documented by Sixlitre.

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1982 Chrysler New Yorker - This well is cast even on the later Thermoquads. 1982 Chrysler New Yorker - With a piece of 3/16 inch fuel line I'll add a ported vacuum source to that well and into the venturi 1982 Chrysler New Yorker - The area to the left of the unblocked idle mixture screws is cleaned off and ready to drill 1982 Chrysler New Yorker - The 1/8 inch drill bit went all the way into the square well. The 3/16 inch bit only 3/8 inch in, just enough to pound in the fuel line. 1982 Chrysler New Yorker - Line seated with a hammer is now a ported vacuum port. I drilled the two 1/16 inch holes into the venturi 1/8 inch apart, into that square… 1982 Chrysler New Yorker - Looking at the square part of the casting that the pipe is centered in pretty much explains where to drill. BTW I saved teh gasket and had…