Mutha’ Thumpr� – High performance street/ strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle. GM LS Gen III/IV 8 Cyl. ’97-Current Three-Bolt 4.8/5.3/5.7/6.0/6.2/7.0L Engines. 227/241 .563 .546
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