If you want to know the timing specs then here it is 4 degrees before top dead center / BTDC. Top dead center is zero on the timing bracket / Tab.
BTDC. are the marks on the left side of the zero on the tab.
ATDC / After top dead center are the marks on the right side of the timing tab.
Hope this answered your question. If not please ask it again.
4 DEGREES BTDC.
4-degrees BTDC. Before top dead center. The Heavyduty sets at 8-degrees BTDC.
4, to 6 degrees advanced or BTDC.
4 to 8 degrees BTDC/ before top dead center. light duty 454 is 4 degrees BTDC Heavy duty 454 is 8 degrees BTDC.
6, to 8 degrees advanced, or BTDC., will work best.
Ddd
8 degrees BTDC. 8 degrees BTDC. 8 degrees BTDC.
4 degrees BTDC ON A 1990 1/2 Ton Truck With The SS-454 With A Throttle Body.
Between 8 and 12 degrees before TDC... My 454 is set at 10 degrees BTDC and it runs great.
what is the ignition timing for a 1988 Chevy 454 engine
Were is the temperature heat sensoe on a 454 chevy motor.
4 btdc