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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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