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(2) GM LS series valve spring compressor tool works by using compressed air in the cylinder at TDC, allowing valve springs or seals changes without removing the cylinder heads. Fit For Works on any GM based LS engines: LS1 LS2 LS3 LS4 LS6 LS7 LS9, LSA, LQ4, LQ9, 4.8, 5.3, 6.0, 6.2, and 7.0.
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