PART NO.  SPL.PAGE  DESCRIPTION                                                                    
1H651     15.A.4    Flywheel with starter ring and dowels -(engine unit, 1500)
1H651     sup.4     Flywheel -(with starter ring and dowels, engine unit, sup)
1H651     16.A.4    Flywheel -(with starter ring and dowels, engine unit, 1600)
1H651     16.A.25   Flywheel -(with starter ring and dowels, engine unit, 1622)-
    changed to 12H587 Com.(E)GC/3708
12H587    16.A.25   Flywheel -(with starter ring and dowels, engine unit, 1622)-
    Com.(E)16GC/3708 -was 1H651
AEH442     TC.A.5    Flywheel complete -(crankshaft, engine, Twin Cam)

Most MGA flywheels were 1.19-in thick solid cast iron, weighing bout 28 pounds. The flywheel for Twin Cam engines was steel, hollowed out on the front face to be lighter weight.

During MGA 1600-MK-II production, beginning in September 1961, Com.(E)16GC/3708, the front face of the flywheel was hollowed out (similar to the Twin Cam flywheel) making the pushrod engine flywheel 8-pounds lighter. See FW-202 for dimensions.

The lighter flywheel followed on into MGB production to end of the 1800 3-main bearing engine (using 3 dowel pins for the clutch cover rather than 2.

1H651 - For pushrod engines - from 1955

AEH442 - For Twin Cam engines - from 1958