Hi and thanks for using 2CarPros. Com. I am a bit confused. You removed the heads or the engine? If only the heads, if they came out, they should go back on.
Here are directions specific to cylinder head removal and replacement for your vehicle. Read through them and see if there is something you are missing. The attached pictures correlate with these directions.
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2001 Mitsubishi Truck Montero Sport ES 4WD V6-3.0L SOHC
Vehicle  Engine, Cooling and Exhaust  Engine  Cylinder Head Gasket  Service and Repair
SERVICE AND REPAIR
REMOVAL AND INSTALLATION
REMOVAL SERVICE POINT
[[A]] CYLINDER HEAD ASSEMBLY REMOVAL
Use special tool MD998051 to tighten each bolt two or three steps in the order shown in the illustration.
INSTALLATION SERVICE POINTS
]]A[[ CYLINDER HEAD GASKET INSTALLATION
Degrease the cylinder head and cylinder block gasket mounting surfaces.
Make sure that the gasket has the proper identification mark for the engine.
Lay the cylinder head gasket on the cylinder block with the identification mark at the front top.
]]B[[ CYLINDER HEAD ASSEMBLY INSTALLATION
CAUTION: Be careful that no foreign material gets into the cylinder, coolant passages or oil passages. Engine damage may result.
Use a scraper to clean the gasket surface of the cylinder head assembly.
CAUTION: Install the head bolt washers with the beveled side facing upwards as shown in the illustration.
Using special tool MD998051 and a torque wrench, tighten the bolts to the specified torque in the order shown in the illustration. (In two or three cycles) Tightening torque: 108 Nm (80 ft. Lbs.)
]]C[[ GASKET/WATER PASSAGE ASSEMBLY INSTALLATION
Bend the tabs onto the water passage assembly. Then install the water passage assembly to the cylinder head so that the gasket does not slip.
Let me know if this helps or if you have other questions.
Take care,
Joe
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Tuesday, June 5th, 2018 AT 5:13 PM