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Rb25det Head


xsv_32
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Im buildin an rb30det and ive got an rb25 head, and i have been told its a series one as it didnt have vvl solenoid thingy on the exhaust camgear. Does this mean no mods to the oil gallery and how good are the s2 heads in comparrison to the others?

The block is fully forged and the bolton stuff sized to make some decent mumbo, will the factory head hold me back or should i look into port matching/polishing etc....

Any ideas or advice would be appriciated :banana:

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