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New Head Gaskets Set For GM Chevrolet LS1/LS6/LQ4/LQ9/4.8/5.3/5.7/6.0 BTR73450 Specification High Quality Brand New Product 100% Factory Tested Replace Part #: For 12558178, BTR73450, 12617944, 12612350, 12630223, 12633904, 12637683, 12585673, 12639249, 89060436, 12551933, 12611384, 12558177, 12622033 Fitment: For GM Chevrolet LS1 LS6 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L These gaskets can also be used with LS3, LS2, and 6.0L iron blocks, as well as 4.8L/5.3L and LS1/LS6 applications,the default bore is 4.09 " .
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