454 CID (7.4L) / 502 CID (8.2L)
SERVICE MANUAL NUMBER 23
Page 3A-17
90-861326--1 MARCH 1999
Cylinder Head Identification
7.4L MPI
Cylinder heads are identified by their smaller and rounded intake ports.
72913
454 MAG MPI / 502 MAG MPI / 8.2L MPI
Cylinder heads are identified by their large rectangular intake ports.
72914
Engine Rotation
Engine rotation terminology at times has caused confusion. To clarify, engine rotation is
determined by observing flywheel rotation from the rear (transmission or stern drive end)
of the engine looking forward (water pump end).
PROPELLER ROTATION IS NOT NECESSARILY THE SAME as engine rotation.
When ordering replacement engines, short blocks or parts for engines, be certain to check
engine rotation. Do not rely on propeller rotation in determining engine rotation.
72001
a
a-Left-Hand Rotation (CCW) - All Sterndrive (MCM) Engines And Inboard (MIE)
(Standard) Rotation
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