Porting Volvo B230 530 cylinder head done, 35 mm + diameter intake runner, now it needs a good 88% throat valve job with wide topcuts for 46/38 mm valves, upgraded valvesprings and a good turbo camshaft.
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Here a whp result with a head like this, BSRT5+ camshaft, EFR7064 turbocharger on pumpfuel.
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Theoretical NA engine results:
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And pr. CID
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