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The GM valve-guide seals (0.560-inch boss) are excellent items, but when the guides are machined, the valve-stem seal boss is generally cut to 0.530, which requires aftermarket seals.
Iron Vortec Head

 The GM valve-guide seals (0.560-inch boss) are excellent items, but when the guides are machined, the valve-stem seal boss is generally cut to 0.530, which requires aftermarket seals.  View Related Article

 

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