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That is standard bore for a B20. Does it have B20 on the block on the LHF corner?
What size valves (stems & heads) does it have?
The cam could be anything since the bore isn't B18, you would have to measure to be 100% certain what it actually is. When you take the lifters out, mark which one is which just in case the cam is reusable so that you can put that lifter back on the same lobe it was mated to.
What does it have for intake system? (You have tubular Volvo manifold copy right?)
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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