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10°BTDC for all B18/B20/B30 engines. Sometimes 15° is quoted for B18B, but it's at 1500rpm, not idle.
The one vintage Volvo guy near me is charging $350+ for a valve adjustment alone seems high to me.
He's charging $1400/hour!
You can get away with adjusting the tappets once every 100,000 miles & points adjustment should last for ages too, i.e., if the timing hasn't changed since last time you checked it then your points gap hasn't changed.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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