Stage 2 Thumprª 227/237 Hydraulic Roller Cam for GEN IV LS 4.8/5.3/6.0L Trucks. Thumprª lobe design for awesome idle lope in modified 5.3L and 6.0L truck engines. Required high lift valve springs ensure maximum power gains. AFM & VVT delete.
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Stage 2 Thumpr 227/237 Hydraulic Roller Cam for GEN IV LS 4.8/5.3/6.0L Trucks
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