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The timing specifications for a 1985 Chevrolet 454 engine typically call for an initial ignition timing setting of around 4 to 6 degrees BTDC (Before Top Dead Center) at idle, with the total timing advance often reaching around 32 to 36 degrees BTDC at higher RPMs. It's important to consult the specific service manual for the exact timing settings, as they can vary based on factors like engine modifications and emissions equipment. Additionally, using a timing light is essential for accurate adjustment.

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1mo ago

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