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With the steel retainer attached to the valve using the 10-degree lock, a micrometer is used to measure the distance between the bottom of the retainer and the top of the seal. Our measurement showed a clearance of 0.550-inch. Knowing this distance will help you to prevent the retainer from bottoming out onto the valve seal, which could eventually tear and allow engine oil to leak down the stem of the valve. Note: our camshaft has 0.540-inch lift, allowing 0.010-inch of clearance.