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and the silver logo really pops against the wrinkle black background
The XPZ requires ported heads with machined valve guides
Rod bearings must be purchased separately
if you do not relocate the seal
2024 Update: After the huge success of our XP-RPM and VS-RPM cam we have now introduced our NIC-RPM and XPZ-RPM cam
Ecotec Ported Head Wire Harnesses & Adapters and the silver logo reallyA ported head increases airflow by reducing restriction therefore more high rpm horsepower. Increasing head flow creates more horsepower at the same boost level and works very well with aftermarket cams. LSJ: All flowed at 28", 3. 5" bore plate, exh had a 1 5 8" flow tube, and stock valves (int. 35mm, exh. 30mm). Do NOT be fooled by other venders flowing heads without a flow tube, in the real world people run headers, not open heads without headers or
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