The timing is 10 o btdc.
The correct timing for a Mercruiser 3.0L 140 engine is 6 degrees BTDC. for a Mercruiser 120 the correct timing is 8 degree BTDC.
do you mean firing order or timing? firing order is 1,3,4,2 timing is 16 degrees =/- 2 btdc @ 750 rpm =/- 50
8 deg. BTDC
4 btdc
10 degrees btdc with spout connector unplugged.
5 btdc or 10 standard btdc if you distribuidor not rotate
35 BTDC 35 BTDC
12 degrees BTDC for 2.0L, 10 degrees BTDC for 2.5L.
10 deg. BTDC aon an automatic, 5 deg btdc on manual
the ignition timing is 6 degree BTDC.
2.3 L - 10 degrees BTDC ( before top dead centre ) for ignition timing 2.9 L - 10 degrees BTDC " 4.0 L - 10 degrees BTDC - distributorless