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R07 Cylinder Heads Valveguide O Ring

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This hole is an oil gallery that will feed oil from the block to integrated valvespring oilers in the valve covers. Notice that it is also grooved to accept an O-ring.
R07 Racing Cylinder Heads - New Power For Chevrolet

 This hole is an oil gallery that will feed oil from the block to integrated valvespring oilers in the valve covers. Notice that it is also grooved to accept an O-ring.  View Related Article

 

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