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Old 01-10-2018, 02:09 PM   #2
Ironangel
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
Re: Vacuum advance 83 454

Listen to what your motor likes. Gasoline was a hellofalot different than whats in the tanks today so you'll probably never match the factory specs. I run my BBC at 16 - 18 degrees BTDC at idle...
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