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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.
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Q: What is the BTDC on a 1981 Chevy 454?
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