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Merlin Race Heads

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The aluminum heads were good, but in order to make a significant jump in power, we needed a pair of heads with serious flow characteristics. We chose iron World Products Merlin VR Race heads, which are very affordable considering the quality. The combustion chambers are 119 cc out of the box, but we had RPM Engines & Machine mill them 0.030 inch to bring the chambers down to 112 cc. This resulted in a compression ratio of 9.12:1.