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My 01 Z with the 5.3 has never had the knock problem. it has 29,000 miles on it, I always use 93 octane, and use 5w-30 Castrol Syntec oil with a AC filter, no probs!
01 Chev Z71 5.3 ECSB LS 3:73, Autotrac, Black Rancho Lift, SL 5.5" Blocks, RSX shocks, skidplate, steer stabilizer, AR Baha 16x10, Goodyear AT/S 305 70 R16
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