Naraku Performance 24mm Intake Manifold Spacer for QMB139.
This spacer is designed to optimize flow from a 24mm intake to the 21mm inlet ports on the Naraku head in the 52.4mm big bore kit. The o-ring side contacts the head surface regardless of orientation of the Naraku logo.
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*It is possible to install this spacer 180Â° reversed. If it is installed incorrectly it will cover the inlet port and restrict flow.