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Re: 1985 GMC 4x4 LS Motor Swap, tons of pics!
FYI on an old thread.... On my 2001 5.3 swap to TH400 there is a factory vacuum accessory port that is not used. It is on the passenger side on the intake plenum. You have to snap off the plastic plug and you can hook up 1/4" vacuum tubing to tranny or other things that need manifold vacuum.
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