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What type of Chevy Cylinder-Heads are 399899 1or y and 3873487 x?

399899 1 or Y: These are Vortec cylinder heads used on the 5.7L LS1 engines. They were used from 1997-2004 in various GM vehicles such as the Camaro, Corvette, and Firebird.

3873487 X: These are also Vortec cylinder heads, but they were used on the 4.8L and 5.3L LS engines from 1999-2007. They are commonly found in GM trucks and SUVs such as the Silverado, Sierra, Tahoe, and Yukon.

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