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21XZ-B Speed Spec II Gold Edition Engine from O.S.

O.S. Engines - 21XZ-B Speed Spec II Gold Edition Engine

The 21XZ-B Speed Spec II is available in a special Gold Edition to commemorate O.S.’s 80th anniversary. A gold cylinder head and carb insert makes it extra-attractive for collectors, while the legendary O.S. performance makes it a must for high-octane racing.  Some other features include a lighter crankshaft, with DLC coating, tungsten weighting and silicone-filled intake passage.  There is also a modified piston and con rod that reduces overall weight.

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