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Old 04-28-2020, 07:48 PM   #3
stayathomedad
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Join Date: Apr 2020
Location: Visalia California
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Some Volvo Penta Red Blocks came with 531 heads. There were many that came with 530 heads. To my knowledge the Volvo Penta AQ151 came with the 531 head.
If its just the head you're looking at you'll find the number cast into the head itself on the exhaust side between exhaust ports 2 and 3. I think 531 heads came with A cams the majority of the time in Volvo Penta applications.
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