Plenum, Intake Manifold for 91~92 ZR-1 LT5. One(1) plenum is required per engine.

NOTE: This is a NEW, GM OEM part. All connector tubes are installed, with the exception of one PCV connector pipe, which is enclosed.

NOTE: This plenum appears to have been pre-assembled with the throttle body and ignition module at the Mercury Marine plant, in preparation for installation on a new engine. At some point, the PCV connector pipe was damaged,removal attempted and aborted. The throttle body & ignition module were removed & the new plenum set aside, back in the new box. Although no actual documentation exists for these circumstances, there are no marks indicating the plenum was ever installed, but there is white grease where the DIS module attaches and a small bit of throttle body gasket residue present. The plenum is, for all paractical purposes, new.

NOTE: Examination of several different plenums in stock, indicate the probability of an EGR style engine intake plenum. Early production plenums have parallel PCV connector pipes & no EGR pipe connectability, although the casting feature is present. THIS SPECIFIC PLENUM has the finished EGR connection, early production style throttle body mating surface and casting provision for the dual throttle cables. The plenum can be furnished with EITHER STYLE PCV Connector Pipe (straight or curved at Customers option, subject to availability of the connector. VERY UNIQUE! Can be used on 93~95 models with EGR or on 90~92 with EGR block-off.