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The y8 head is better flow. PM me for price
what flow numbers have you seen between the 2?
not unless you got mad portwork done to it. It has long since been established that the P08 castings flow far better than the P2J versions for numerous reasons, most notably the curved intake ports and offset dividers. The only real advantage to the y8 style head is the quench pads which help discourage detonation when running aggressive ignition timing with either retarded high compression or super high boost levels.