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Originally Posted by c1800
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The uncertainty with those documents is the application to the 1972 B20A. The owners manual is for a 1971 (I recognize it because I have the same booklet in my glove box) and the Volvo green book appears to be for earlier B20A & B20B engines because of the CR listed for the B20B. In North America, the 'tunes' changed for the engines in 1972 because of emission requirements and the 10 deg at 600-800 RPM might be correct for a 1972 B20A.