Small Block Chevy Vortec RPM Manifold Installation

Instructions for this small block Chevy Vortec RPM Manifold:
1) Use only a GM #12529094 intake gasket set when installing this intake manifold.
2) Fully clean the cylinder head intake flanges and the engine block end seal surfaces.
3) Install the intake gaskets to the cylinder head intake flanges. Two dowels on the intake manifold gasket will locate into dowel holes in the cylinder head. Do not use any type of gasket sealer on the intake gaskets. The O-rings are designed to seal without chemical sealers.
4) Do not use cork or rubber end seals. Use RTV silicone sealer instead. Apply a ž” high bead across each block end seal surface, overlapping the intake gasket at the four corners. This method will eliminate end seal slippage and deterioration.
5) Install the intake manifold bolts. Apply Loctite 242 to the intake bolt threads. Carefully tighten the intake manifold bolts evenly until the intake manifold has compressed the o-ring section of the gasket. Torque all of the manifold bolts in the sequence shown in Figure 1 to 11 ft/lbs.

SPECIAL NOTE: This intake manifold is primarily intended for use with Vortec heads on pre-Vortec blocks. Standard engine blocks route thermostat bypass water from the block directly to the water pump through the passenger side water pump mounting flange. If the manifold is used on a 1996 and later Vortec engine that does not have the in-block bypass passage, you must route a thermostat bypass hose from the water bypass port on the front of the manifold to the 5/8” hose nipple on the passenger side of the Vortec water pump. Use a 3/8” pipe to 5/8” hose nipple fitting, and a 7” length of 5/8” hose to accomplish this. If your engine block has the thermostat bypass passage, use the 3/8” NPT plug supplied in the kit to plug the bypass port in the front of the intake manifold.

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