Marine Power 4.3 VORTEC MPI Owner's Manual page 33

10.
Engine Maintenance
6.2L LS3/6.2 LSA Longitudinal mount (under
starboard exhaust manifold) Half System: Air
bleed is located on top of port cylinder head at the front.
Use a 10mm socket with 9" extension and a ¼" drive
ratchet. Loosen bolt holding down head bleed tube
connection while engine is running. Re-tighten after air
bubbles have stopped and only coolant is flowing out of
the connection.
Air Bleed Location
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