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I second what Burn Bros said.
85mm is the max you can bore the Birals. A set of custom 85mm pistons will run about $1000. Just tell that what cams, and CR you want. CP pistons should still have the needed info from when I had my last set made.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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