Are LS7 lifters a good replacement for noisy stock LS lifters?

Yes. GM LS7 lifters are the common replacement and upgrade for LS lifters (they're in many of Speedway's cam-swap recipes). They're hydraulic roller lifters that fit all Gen III/IV engines and sit four per tray, four trays (two per side). Current prices in our catalog:

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• Genuine GM LS7 lifters, set of 16: about $200 (ICT Billet)
• GM part 12499225 set: $463–476 (Full Throttle Speed, LSE9x)
• BTR Delphi LS7 lifters with tray kit ("like 12499225"): $239.99 (Full Throttle Speed)
• Lifter trays, set of 4: $40–50

First confirm it's a lifter: a collapsed lifter usually causes a single-cylinder misfire and a loose rocker, not just noise. Replacing lifters means removing the heads (intake, rockers, heads, new head gaskets); soak new lifters in oil first. On AFM engines, do a full AFM delete rather than only swapping lifters.