Page 130 of GM Goodwrench Engines Catalog by GM Goodwrench

GOODWRENCH SERVICE REPLACEMENT ENGINES Section V Page 129 August 2004 12339196 427 CID Reman 7.0L 1985-90 Chevrolet, GMC C7 (L43) 1988-90 Chevrolet, GMC C6,7 (L43) NA5 (427) 1990 Chevrolet, GMC C5,6,7 (LR0) 1990 Chevrolet, GMC P6 (LR0) Notes: Head casting is 14081052 (except Columbia)(for 1 st design, see 12339195). INSTALLATION INSTRUCTIONS This Chevrolet Mark IV engine has been remanufactured subsequent to the model year of the vehicle and incorporates design refinements not included in original service information (i.e., 1982 engines may incorporate design features normally associated with 1987 models). If future service is required for this engine, consult GM Parts catalogs, GM Part and Accessories information bulletins, and Chevrolet dealer service bulletins for proper service parts and service procedures necessary to accommodate these revisions. Use new seals and gaskets. Install the supplied oil pump and transfer all necessary components including oil pan and valve covers to the replacement engine. Thoroughly clean all old parts to avoid possible contamination. 1990 trucks have an ESC sensor. It may be necessary to tap the oil-tube mounting hole with 1/4-18 dry-seal tap to install the sensor on the replacement engine. Use a thread sealer to prevent coolant leaks. On certain models with shallow oil pan, a new oil pump assembly, part number 14067529, with shorter pickup tube must be installed in place of the pump supplied with this engine. Attach two Goodwrench engine decals (enclosed in instructions envelope) to clean valve covers. CAUTION: The oil pump in this engine must be primed before starting engine. Refer to vehicle service chassis manual for proper priming procedures. Also, check engine oil level before starting engine. Use 6 quarts of Starburst certified oil in the viscosity suitable for your climate conditions. DAMAGE COULD RESULT IF ENGINE IS STARTED WITHOUT OIL OR IF OIL PUMP IS NOT PRIMED. 12530427 427 CID New 7.0L 1995 Chevrolet, GMC C6,7 (LR0) 1995-96 Chevrolet, GMC P6 (LR0) MF1 1995-98 Chevrolet, GMC B7 (LR0) MF1, ENN 1996 Chevrolet, GMC C6,7 (LR0) MWW, MWX (exc. ENN) 1996-98 Chevrolet, GMC C6,7 (LR0) ME4, ME6, MF1, MT9, MWX Notes: 6-bolt Front Cover Replaces: 12524680 Replaced By: INSTALLATION INSTRUCTIONS No special installation instructions are necessary. Please refer to the general installation procedure section of this book.

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