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Old 06-07-2017, 10:06 PM   #4
leftybass209
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Join Date: Feb 2011
Location: Modesto, CA
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Re: Initial timing specs for 1975 400 small block

What I got in the GM 1976 manual was 2 degrees BTC for a Cal. Emissions 400, and 4 degrees BTC for a Federal Emissions 400. 8 degrees for a 350.

Distributor advance is 2 degrees difference between the two, maxing at 20 or 22 respectively.
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